[WK2] Disable network cache speculative validation by default

https://bugs.webkit.org/show_bug.cgi?id=155857
<rdar://problem/25233210>

Reviewed by Alex Christensen.

Disable network cache speculative validation by default. Clients such
as Safari now use the API added in r198544 to enable if they want.

* UIProcess/API/APIProcessPoolConfiguration.h:

Canonical link: https://commits.webkit.org/173959@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@198651 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebKit2/ChangeLog

@@ -1,3 +1,16 @@
+2016-03-24  Chris Dumez  <cdumez@apple.com>
+
+        [WK2] Disable network cache speculative validation by default
+        https://bugs.webkit.org/show_bug.cgi?id=155857
+        <rdar://problem/25233210>
+
+        Reviewed by Alex Christensen.
+
+        Disable network cache speculative validation by default. Clients such
+        as Safari now use the API added in r198544 to enable if they want.
+
+        * UIProcess/API/APIProcessPoolConfiguration.h:
+
 2016-03-24  Alex Christensen  <achristensen@webkit.org>
 
         Fix null dereferencing in NetworkLoad::continueCanAuthenticateAgainstProtectionSpace

Source/WebKit2/UIProcess/API/APIProcessPoolConfiguration.h

@@ -96,8 +96,7 @@ class ProcessPoolConfiguration final : public ObjectImpl<Object::Type::ProcessPo
     bool m_shouldHaveLegacyDataStore { false };
 
     unsigned m_maximumProcessCount { 0 };
-    // FIXME: This should be disabled by default once Safari has been updated to explicitly enable it.
-    bool m_diskCacheSpeculativeValidationEnabled { true };
+    bool m_diskCacheSpeculativeValidationEnabled { false };
     WebKit::CacheModel m_cacheModel { WebKit::CacheModelPrimaryWebBrowser };
     int64_t m_diskCacheSizeOverride { -1 };