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Replace all uses of ExceptionCodeWithMessage with WebCore::Exception
https://bugs.webkit.org/show_bug.cgi?id=163178

Reviewed by Sam Weinig.

* Modules/indexeddb/IDBCursor.cpp:
(WebCore::IDBCursor::stringToDirection): Return an Optional instead of
using an ExceptionCode out argument, since this function just needs to
indicate failure, not actually throw an exception.
(WebCore::IDBCursor::update): Return ExceptionOr instead of using an
ExceptionCodeWithMessage out argument.
(WebCore::IDBCursor::advance): Ditto.
(WebCore::IDBCursor::continueFunction): Ditto.
(WebCore::IDBCursor::deleteFunction): Ditto.
* Modules/indexeddb/IDBCursor.h: Updated for above changes.

* Modules/indexeddb/IDBCursor.idl: Sorted extended attributes alphabetically.
Use MayThrowException instead of MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBDatabase.cpp:
(WebCore::IDBDatabase::createObjectStore): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBDatabase::transaction): Ditto.
(WebCore::IDBDatabase::deleteObjectStore): Ditto.
* Modules/indexeddb/IDBDatabase.h: Updated for above changes.

* Modules/indexeddb/IDBDatabase.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBFactory.cpp:
(WebCore::IDBFactory::open): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBFactory::openInternal): Ditto.
(WebCore::IDBFactory::deleteDatabase): Ditto.
(WebCore::IDBFactory::cmp): Ditto.
* Modules/indexeddb/IDBFactory.h: Updated for above changes.

* Modules/indexeddb/IDBFactory.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBIndex.cpp:
(WebCore::IDBIndex::openCursor): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBIndex::count): Ditto.
(WebCore::IDBIndex::doCount): Ditto.
(WebCore::IDBIndex::openKeyCursor): Ditto.
(WebCore::IDBIndex::get): Ditto.
(WebCore::IDBIndex::doGet): Ditto.
(WebCore::IDBIndex::getKey): Ditto.
(WebCore::IDBIndex::doGetKey): Ditto.
* Modules/indexeddb/IDBIndex.h: Updated for above changes.

* Modules/indexeddb/IDBIndex.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBKeyRange.cpp:
(WebCore::IDBKeyRange::only): Return ExceptionOr instead of
using an ExceptionCode out argument.
(WebCore::IDBKeyRange::lowerBound): Ditto.
(WebCore::IDBKeyRange::upperBound): Ditto.
(WebCore::IDBKeyRange::bound): Ditto.
* Modules/indexeddb/IDBKeyRange.h: Updated for above changes.
* Modules/indexeddb/IDBKeyRange.idl: Use MayThrowException instead of
MayThrowLegacyException.

* Modules/indexeddb/IDBObjectStore.cpp:
(WebCore::IDBObjectStore::openCursor): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBObjectStore::get): Ditto.
(WebCore::IDBObjectStore::add): Ditto.
(WebCore::IDBObjectStore::put): Ditto.
(WebCore::IDBObjectStore::putForCursorUpdate): Ditto.
(WebCore::IDBObjectStore::putOrAdd): Ditto.
(WebCore::IDBObjectStore::deleteFunction): Ditto.
(WebCore::IDBObjectStore::doDelete): Ditto.
(WebCore::IDBObjectStore::clear): Ditto.
(WebCore::IDBObjectStore::createIndex): Ditto.
(WebCore::IDBObjectStore::index): Ditto.
(WebCore::IDBObjectStore::deleteIndex): Ditto.
(WebCore::IDBObjectStore::count): Ditto.
(WebCore::IDBObjectStore::doCount): Ditto.
* Modules/indexeddb/IDBObjectStore.h: Updated for above changes.

* Modules/indexeddb/IDBObjectStore.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBRequest.cpp:
(WebCore::IDBRequest::errorCode): Deleted. Was dead code.
(WebCore::IDBRequest::error): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
* Modules/indexeddb/IDBRequest.h: Updated for above changes.

* Modules/indexeddb/IDBRequest.idl: Use GetterMayThrowException instead of
GetterMayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBTransaction.cpp:
(WebCore::IDBTransaction::stringToMode): Return an Optional instead of
using an ExceptionCode out argument, since this function just needs to
indicate failure, not actually throw an exception.
(WebCore::IDBTransaction::db): Tweaked code a bit.
(WebCore::IDBTransaction::error): Return a pointer instead of a RefPtr.
(WebCore::IDBTransaction::objectStore): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBTransaction::abortDueToFailedRequest): Call internalAbort.
(WebCore::IDBTransaction::abort): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBTransaction::internalAbort): Added a version that asserts
instead of throwing an exception for internal use.
(WebCore::IDBTransaction::stop): Call internalAbort.
* Modules/indexeddb/IDBTransaction.h: Updated for above changes.

* Modules/indexeddb/IDBTransaction.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/client/IDBConnectionProxy.cpp:
(WebCore::IDBClient::IDBConnectionProxy::openDatabase): Updated to return
a Ref instead of a RefPtr, since the function can never return null.
(WebCore::IDBClient::IDBConnectionProxy::deleteDatabase): Ditto.
* Modules/indexeddb/client/IDBConnectionProxy.h: Updated for above changes.

* Modules/mediastream/MediaEndpointPeerConnection.cpp:
(WebCore::MediaEndpointPeerConnection::setLocalDescriptionTask): Updated
exception handling to use ExceptionOr instead of ExceptionCodeWithMessage.
(WebCore::MediaEndpointPeerConnection::setRemoteDescriptionTask): Ditto.
* Modules/mediastream/MediaEndpointSessionDescription.cpp:
(WebCore::MediaEndpointSessionDescription::create): Ditto.
* Modules/mediastream/MediaEndpointSessionDescription.h: Updated for above change.

* bindings/js/JSDOMBinding.cpp:
(WebCore::createDOMException): Added overload for Exception.
(WebCore::throwDOMException): Deleted overload for ExceptionCodeWithMessage.
Updated code to call the new createDOMException function.
(WebCore::setDOMExceptionSlow): Ditto.
(WebCore::setDOMException): Ditto.

* bindings/js/JSDOMBinding.h: Added overload of createDOMException that takes
an Exception. Deleted functions dealing with ExceptionCodeWithMessage. Fixed
interface of toJSNumber and toJSNullableNumber and implemented toJSNumber.

* bindings/js/JSDOMPromise.cpp:
(WebCore::DeferredPromise::reject): Added overload that takes an Exception.
* bindings/js/JSDOMPromise.h: Updated for above change.

* bindings/js/JSHistoryCustom.cpp:
(WebCore::JSHistory::pushState): Use propagateException to deal with
ExceptionOr instead of ExceptionCodeWithMessage.
(WebCore::JSHistory::replaceState): Ditto.

* bindings/js/JSIDBDatabaseCustom.cpp:
(WebCore::JSIDBDatabase::createObjectStore): Use toJS and
to deal with ExceptionOr rather than setDOMException to deal
with ExceptionCodeWithMessage.

* bindings/js/JSIDBRequestCustom.cpp:
(WebCore::JSIDBRequest::result): Use propagateException and
Exception rather than setDOMException and ExceptionCodeWithMessage.

* bindings/scripts/CodeGeneratorJS.pm:
(GenerateImplementation): Removed support for GetterMayThrowLegacyExceptionWithMessage,
SetterMayThrowLegacyExceptionWithMessage, and MayThrowLegacyExceptionWithMessage.
(GenerateReturnParameters): Ditto.
(GenerateImplementationFunctionCall): Ditto.
(GenerateConstructorDefinition): Ditto.

* bindings/scripts/IDLAttributes.txt: Removed GetterMayThrowLegacyExceptionWithMessage,
SetterMayThrowLegacyExceptionWithMessage, and MayThrowLegacyExceptionWithMessage.

* bindings/scripts/test/JS/JSTestObj.cpp: Regenerated.
* bindings/scripts/test/TestObj.idl: Removed tests cases for now-removed attributes.

* dom/CustomElementRegistry.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* dom/ExceptionCode.h: Removed ExceptionCodeWithMessage. Also updated to use pragma
once, removed include of WTFString.h and switched to using instead of typedef.

* history/HistoryItem.h: Return a pointer instead of a RefPtr from stateObject
to cut down a little on unnecessary reference count churn.

* inspector/InspectorIndexedDBAgent.cpp: Updated all the code that uses IDB
classes to use the new versions rather than the old ExceptionCodeWithMessage versions.

* page/DOMWindow.cpp:
(WebCore::DOMWindow::history): Pass a reference instead of a pointer.

* page/History.cpp:
(WebCore::History::History): Take a reference instead of a pointer.
(WebCore::History::length): Tweaked to use a local variable.
(WebCore::History::state): Return a pointer instead of a PassRefPtr.
(WebCore::History::stateInternal): Ditto. Also use early return consistently.
(WebCore::History::isSameAsCurrentState): Updated for above change.
(WebCore::History::stateObjectAdded): Return ExceptionOr rather than taking an
ExceptionCodeWithMessage out argument.

* page/History.h: Use pragma once. Removed some unneeded includes. Marked class final.
Updated for changes above.

* page/History.idl: Use MayThrowException instead of MayThrowLegacyException.

Canonical link: https://commits.webkit.org/181024@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@206976 268f45cc-cd09-0410-ab3c-d52691b4dbfc
  • Loading branch information
darinadler committed Oct 10, 2016
1 parent a87c0be commit ed43edee9f8f114c3b2db3c0420e23f926a968ee
Showing with 900 additions and 1,225 deletions.
  1. +201 −0 Source/WebCore/ChangeLog
  2. +71 −133 Source/WebCore/Modules/indexeddb/IDBCursor.cpp
  3. +7 −8 Source/WebCore/Modules/indexeddb/IDBCursor.h
  4. +6 −6 Source/WebCore/Modules/indexeddb/IDBCursor.idl
  5. +42 −80 Source/WebCore/Modules/indexeddb/IDBDatabase.cpp
  6. +5 −5 Source/WebCore/Modules/indexeddb/IDBDatabase.h
  7. +5 −5 Source/WebCore/Modules/indexeddb/IDBDatabase.idl
  8. +24 −47 Source/WebCore/Modules/indexeddb/IDBFactory.cpp
  9. +5 −6 Source/WebCore/Modules/indexeddb/IDBFactory.h
  10. +3 −4 Source/WebCore/Modules/indexeddb/IDBFactory.idl
  11. +74 −126 Source/WebCore/Modules/indexeddb/IDBIndex.cpp
  12. +13 −13 Source/WebCore/Modules/indexeddb/IDBIndex.h
  13. +12 −12 Source/WebCore/Modules/indexeddb/IDBIndex.idl
  14. +18 −30 Source/WebCore/Modules/indexeddb/IDBKeyRange.cpp
  15. +6 −5 Source/WebCore/Modules/indexeddb/IDBKeyRange.h
  16. +4 −4 Source/WebCore/Modules/indexeddb/IDBKeyRange.idl
  17. +136 −266 Source/WebCore/Modules/indexeddb/IDBObjectStore.cpp
  18. +20 −20 Source/WebCore/Modules/indexeddb/IDBObjectStore.h
  19. +15 −15 Source/WebCore/Modules/indexeddb/IDBObjectStore.idl
  20. +4 −13 Source/WebCore/Modules/indexeddb/IDBRequest.cpp
  21. +2 −2 Source/WebCore/Modules/indexeddb/IDBRequest.h
  22. +1 −1 Source/WebCore/Modules/indexeddb/IDBRequest.idl
  23. +35 −41 Source/WebCore/Modules/indexeddb/IDBTransaction.cpp
  24. +5 −4 Source/WebCore/Modules/indexeddb/IDBTransaction.h
  25. +3 −3 Source/WebCore/Modules/indexeddb/IDBTransaction.idl
  26. +4 −4 Source/WebCore/Modules/indexeddb/client/IDBConnectionProxy.cpp
  27. +2 −2 Source/WebCore/Modules/indexeddb/client/IDBConnectionProxy.h
  28. +14 −14 Source/WebCore/Modules/mediastream/MediaEndpointPeerConnection.cpp
  29. +6 −12 Source/WebCore/Modules/mediastream/MediaEndpointSessionDescription.cpp
  30. +4 −6 Source/WebCore/Modules/mediastream/MediaEndpointSessionDescription.h
  31. +6 −23 Source/WebCore/bindings/js/JSDOMBinding.cpp
  32. +13 −13 Source/WebCore/bindings/js/JSDOMBinding.h
  33. +12 −0 Source/WebCore/bindings/js/JSDOMPromise.cpp
  34. +1 −0 Source/WebCore/bindings/js/JSDOMPromise.h
  35. +2 −6 Source/WebCore/bindings/js/JSHistoryCustom.cpp
  36. +1 −4 Source/WebCore/bindings/js/JSIDBDatabaseCustom.cpp
  37. +2 −6 Source/WebCore/bindings/js/JSIDBRequestCustom.cpp
  38. +18 −50 Source/WebCore/bindings/scripts/CodeGeneratorJS.pm
  39. +0 −3 Source/WebCore/bindings/scripts/IDLAttributes.txt
  40. +0 −97 Source/WebCore/bindings/scripts/test/JS/JSTestObj.cpp
  41. +0 −3 Source/WebCore/bindings/scripts/test/TestObj.idl
  42. +2 −4 Source/WebCore/dom/CustomElementRegistry.idl
  43. +2 −13 Source/WebCore/dom/ExceptionCode.h
  44. +1 −1 Source/WebCore/history/HistoryItem.h
  45. +52 −53 Source/WebCore/inspector/InspectorIndexedDBAgent.cpp
  46. +1 −1 Source/WebCore/page/DOMWindow.cpp
  47. +28 −39 Source/WebCore/page/History.cpp
  48. +10 −20 Source/WebCore/page/History.h
  49. +2 −2 Source/WebCore/page/History.idl
@@ -1,3 +1,204 @@
2016-10-09 Darin Adler <darin@apple.com>

Replace all uses of ExceptionCodeWithMessage with WebCore::Exception
https://bugs.webkit.org/show_bug.cgi?id=163178

Reviewed by Sam Weinig.

* Modules/indexeddb/IDBCursor.cpp:
(WebCore::IDBCursor::stringToDirection): Return an Optional instead of
using an ExceptionCode out argument, since this function just needs to
indicate failure, not actually throw an exception.
(WebCore::IDBCursor::update): Return ExceptionOr instead of using an
ExceptionCodeWithMessage out argument.
(WebCore::IDBCursor::advance): Ditto.
(WebCore::IDBCursor::continueFunction): Ditto.
(WebCore::IDBCursor::deleteFunction): Ditto.
* Modules/indexeddb/IDBCursor.h: Updated for above changes.

* Modules/indexeddb/IDBCursor.idl: Sorted extended attributes alphabetically.
Use MayThrowException instead of MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBDatabase.cpp:
(WebCore::IDBDatabase::createObjectStore): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBDatabase::transaction): Ditto.
(WebCore::IDBDatabase::deleteObjectStore): Ditto.
* Modules/indexeddb/IDBDatabase.h: Updated for above changes.

* Modules/indexeddb/IDBDatabase.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBFactory.cpp:
(WebCore::IDBFactory::open): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBFactory::openInternal): Ditto.
(WebCore::IDBFactory::deleteDatabase): Ditto.
(WebCore::IDBFactory::cmp): Ditto.
* Modules/indexeddb/IDBFactory.h: Updated for above changes.

* Modules/indexeddb/IDBFactory.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBIndex.cpp:
(WebCore::IDBIndex::openCursor): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBIndex::count): Ditto.
(WebCore::IDBIndex::doCount): Ditto.
(WebCore::IDBIndex::openKeyCursor): Ditto.
(WebCore::IDBIndex::get): Ditto.
(WebCore::IDBIndex::doGet): Ditto.
(WebCore::IDBIndex::getKey): Ditto.
(WebCore::IDBIndex::doGetKey): Ditto.
* Modules/indexeddb/IDBIndex.h: Updated for above changes.

* Modules/indexeddb/IDBIndex.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBKeyRange.cpp:
(WebCore::IDBKeyRange::only): Return ExceptionOr instead of
using an ExceptionCode out argument.
(WebCore::IDBKeyRange::lowerBound): Ditto.
(WebCore::IDBKeyRange::upperBound): Ditto.
(WebCore::IDBKeyRange::bound): Ditto.
* Modules/indexeddb/IDBKeyRange.h: Updated for above changes.
* Modules/indexeddb/IDBKeyRange.idl: Use MayThrowException instead of
MayThrowLegacyException.

* Modules/indexeddb/IDBObjectStore.cpp:
(WebCore::IDBObjectStore::openCursor): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBObjectStore::get): Ditto.
(WebCore::IDBObjectStore::add): Ditto.
(WebCore::IDBObjectStore::put): Ditto.
(WebCore::IDBObjectStore::putForCursorUpdate): Ditto.
(WebCore::IDBObjectStore::putOrAdd): Ditto.
(WebCore::IDBObjectStore::deleteFunction): Ditto.
(WebCore::IDBObjectStore::doDelete): Ditto.
(WebCore::IDBObjectStore::clear): Ditto.
(WebCore::IDBObjectStore::createIndex): Ditto.
(WebCore::IDBObjectStore::index): Ditto.
(WebCore::IDBObjectStore::deleteIndex): Ditto.
(WebCore::IDBObjectStore::count): Ditto.
(WebCore::IDBObjectStore::doCount): Ditto.
* Modules/indexeddb/IDBObjectStore.h: Updated for above changes.

* Modules/indexeddb/IDBObjectStore.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBRequest.cpp:
(WebCore::IDBRequest::errorCode): Deleted. Was dead code.
(WebCore::IDBRequest::error): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
* Modules/indexeddb/IDBRequest.h: Updated for above changes.

* Modules/indexeddb/IDBRequest.idl: Use GetterMayThrowException instead of
GetterMayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/IDBTransaction.cpp:
(WebCore::IDBTransaction::stringToMode): Return an Optional instead of
using an ExceptionCode out argument, since this function just needs to
indicate failure, not actually throw an exception.
(WebCore::IDBTransaction::db): Tweaked code a bit.
(WebCore::IDBTransaction::error): Return a pointer instead of a RefPtr.
(WebCore::IDBTransaction::objectStore): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBTransaction::abortDueToFailedRequest): Call internalAbort.
(WebCore::IDBTransaction::abort): Return ExceptionOr instead of
using an ExceptionCodeWithMessage out argument.
(WebCore::IDBTransaction::internalAbort): Added a version that asserts
instead of throwing an exception for internal use.
(WebCore::IDBTransaction::stop): Call internalAbort.
* Modules/indexeddb/IDBTransaction.h: Updated for above changes.

* Modules/indexeddb/IDBTransaction.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* Modules/indexeddb/client/IDBConnectionProxy.cpp:
(WebCore::IDBClient::IDBConnectionProxy::openDatabase): Updated to return
a Ref instead of a RefPtr, since the function can never return null.
(WebCore::IDBClient::IDBConnectionProxy::deleteDatabase): Ditto.
* Modules/indexeddb/client/IDBConnectionProxy.h: Updated for above changes.

* Modules/mediastream/MediaEndpointPeerConnection.cpp:
(WebCore::MediaEndpointPeerConnection::setLocalDescriptionTask): Updated
exception handling to use ExceptionOr instead of ExceptionCodeWithMessage.
(WebCore::MediaEndpointPeerConnection::setRemoteDescriptionTask): Ditto.
* Modules/mediastream/MediaEndpointSessionDescription.cpp:
(WebCore::MediaEndpointSessionDescription::create): Ditto.
* Modules/mediastream/MediaEndpointSessionDescription.h: Updated for above change.

* bindings/js/JSDOMBinding.cpp:
(WebCore::createDOMException): Added overload for Exception.
(WebCore::throwDOMException): Deleted overload for ExceptionCodeWithMessage.
Updated code to call the new createDOMException function.
(WebCore::setDOMExceptionSlow): Ditto.
(WebCore::setDOMException): Ditto.

* bindings/js/JSDOMBinding.h: Added overload of createDOMException that takes
an Exception. Deleted functions dealing with ExceptionCodeWithMessage. Fixed
interface of toJSNumber and toJSNullableNumber and implemented toJSNumber.

* bindings/js/JSDOMPromise.cpp:
(WebCore::DeferredPromise::reject): Added overload that takes an Exception.
* bindings/js/JSDOMPromise.h: Updated for above change.

* bindings/js/JSHistoryCustom.cpp:
(WebCore::JSHistory::pushState): Use propagateException to deal with
ExceptionOr instead of ExceptionCodeWithMessage.
(WebCore::JSHistory::replaceState): Ditto.

* bindings/js/JSIDBDatabaseCustom.cpp:
(WebCore::JSIDBDatabase::createObjectStore): Use toJS and
to deal with ExceptionOr rather than setDOMException to deal
with ExceptionCodeWithMessage.

* bindings/js/JSIDBRequestCustom.cpp:
(WebCore::JSIDBRequest::result): Use propagateException and
Exception rather than setDOMException and ExceptionCodeWithMessage.

* bindings/scripts/CodeGeneratorJS.pm:
(GenerateImplementation): Removed support for GetterMayThrowLegacyExceptionWithMessage,
SetterMayThrowLegacyExceptionWithMessage, and MayThrowLegacyExceptionWithMessage.
(GenerateReturnParameters): Ditto.
(GenerateImplementationFunctionCall): Ditto.
(GenerateConstructorDefinition): Ditto.

* bindings/scripts/IDLAttributes.txt: Removed GetterMayThrowLegacyExceptionWithMessage,
SetterMayThrowLegacyExceptionWithMessage, and MayThrowLegacyExceptionWithMessage.

* bindings/scripts/test/JS/JSTestObj.cpp: Regenerated.
* bindings/scripts/test/TestObj.idl: Removed tests cases for now-removed attributes.

* dom/CustomElementRegistry.idl: Use MayThrowException instead of
MayThrowLegacyExceptionWithMessage.

* dom/ExceptionCode.h: Removed ExceptionCodeWithMessage. Also updated to use pragma
once, removed include of WTFString.h and switched to using instead of typedef.

* history/HistoryItem.h: Return a pointer instead of a RefPtr from stateObject
to cut down a little on unnecessary reference count churn.

* inspector/InspectorIndexedDBAgent.cpp: Updated all the code that uses IDB
classes to use the new versions rather than the old ExceptionCodeWithMessage versions.

* page/DOMWindow.cpp:
(WebCore::DOMWindow::history): Pass a reference instead of a pointer.

* page/History.cpp:
(WebCore::History::History): Take a reference instead of a pointer.
(WebCore::History::length): Tweaked to use a local variable.
(WebCore::History::state): Return a pointer instead of a PassRefPtr.
(WebCore::History::stateInternal): Ditto. Also use early return consistently.
(WebCore::History::isSameAsCurrentState): Updated for above change.
(WebCore::History::stateObjectAdded): Return ExceptionOr rather than taking an
ExceptionCodeWithMessage out argument.

* page/History.h: Use pragma once. Removed some unneeded includes. Marked class final.
Updated for changes above.

* page/History.idl: Use MayThrowException instead of MayThrowLegacyException.

2016-10-07 Ryosuke Niwa <rniwa@webkit.org>

REGRESSION(r165103): labels list doesn't get invalidated when other lists are invalidated at document level

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