[DOM] Fix null namespace handling in Node.isDefaultNamespace().

[chromium-wpt-export-bot]

• Fix the implementation bug.
• Remove obsolete test in the legacy DOM conformance tests.
• Add tests for DocumentType node to WPT.

BUG=699812

Review-Url: https://codereview.chromium.org/2737273002
Cr-Commit-Position: refs/heads/master@{#456002}

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Firefox (nightly channel)

Testing web-platform-tests at revision 72ed061
Using browser at version BuildID 20170306110339; SourceStamp 966464a68a2cb3ca1125808e34abb5c1d34e3797
Starting 10 test iterations
All results were stable

All results

1 test ran

/dom/nodes/Node-lookupNamespaceURI.html

Subtest	Results	Messages
	OK
DocumentFragment should have null namespace, prefix null	PASS
DocumentFragment should have null namespace, prefix ""	PASS
DocumentFragment should have null namespace, prefix "foo"	PASS
DocumentFragment should have null namespace, prefix "xmlns"	PASS
DocumentFragment is in default namespace, prefix null	PASS
DocumentFragment is in default namespace, prefix ""	PASS
DocumentFragment is in default namespace, prefix "foo"	PASS
DocumentFragment is in default namespace, prefix "xmlns"	PASS
DocumentType should have null nemspace, prefix null	PASS
DocumentType should have null namespace, prefix ""	PASS
DocumentType should have null namespace, prefix "foo"	PASS
DocumentType should have null namespace, prefix "xmlns"	PASS
DocumentType is in default namespace, prefix null	PASS
DocumentType is in default namespace, prefix ""	PASS
DocumentType is in default namespace, prefix "foo"	PASS
DocumentType is in default namespace, prefix "xmlns"	PASS
Element should have null namespace, prefix null	PASS
Element should have null namespace, prefix ""	PASS
Element should not have namespace matching prefix with namespaceURI value	PASS
Element should not have XMLNS namespace	FAIL	assert_equals: expected (object) null but got (string) "http://www.w3.org/2000/xmlns/"
Element has namespace URI matching prefix	FAIL	assert_equals: expected (string) "fooNamespace" but got (object) null
Empty namespace is not default, prefix null	PASS
Empty namespace is not default, prefix ""	PASS
fooNamespace is not default	PASS
xmlns namespace is not default	PASS
Element should have baz namespace, prefix null	PASS
Element should have baz namespace, prefix ""	PASS
Element does not has namespace with xlmns prefix	FAIL	assert_equals: expected (object) null but got (string) "http://www.w3.org/2000/xmlns/"
Element has bar namespace	PASS
Empty namespace is not default on fooElem, prefix null	PASS
Empty namespace is not default on fooElem, prefix ""	PASS
bar namespace is not default	PASS
baz namespace is default	PASS
Comment should inherit baz namespace	PASS
Comment should inherit baz namespace	PASS
Comment should inherit namespace URI matching prefix	FAIL	assert_equals: expected (string) "fooNamespace" but got (object) null
Comment should inherit bar namespace	PASS
For comment, empty namespace is not default, prefix null	PASS
For comment, empty namespace is not default, prefix ""	PASS
For comment, fooNamespace is not default	PASS
For comment, xmlns namespace is not default	PASS
For comment, inherited bar namespace is not default	PASS
For comment, inherited baz namespace is default	PASS
Child element should inherit baz namespace	FAIL	assert_equals: expected "childNamespace" but got "bazURI"
Child element should have null namespace	FAIL	assert_equals: expected "childNamespace" but got "bazURI"
Child element should not have XMLNS namespace	FAIL	assert_equals: expected (object) null but got (string) "http://www.w3.org/2000/xmlns/"
Child element has namespace URI matching prefix	FAIL	assert_equals: expected (string) "fooNamespace" but got (object) null
Empty namespace is not default for child, prefix null	PASS
Empty namespace is not default for child, prefix ""	PASS
fooNamespace is not default for child	PASS
xmlns namespace is not default for child	PASS
bar namespace is not default for child	PASS
baz namespace is default for child	FAIL	assert_equals: expected false but got true
childNamespace is default for child	FAIL	assert_equals: expected true but got false
Document should have xhtml namespace, prefix null	FAIL	assert_equals: expected "http://www.w3.org/1999/xhtml" but got "bazURI"
Document should have xhtml namespace, prefix ""	FAIL	assert_equals: expected "http://www.w3.org/1999/xhtml" but got "bazURI"
Document has no namespace URI matching prefix	PASS
Document has bar namespace	PASS
For document, empty namespace is not default, prefix null	PASS
For document, empty namespace is not default, prefix ""	PASS
For document, fooNamespace is not default	PASS
For document, xmlns namespace is not default	PASS
For document, bar namespace is not default	PASS
For document, baz namespace is not default	FAIL	assert_equals: expected false but got true
For document, xhtml namespace is default	FAIL	assert_equals: expected true but got false
Comment does not have bar namespace	PASS

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Chrome (unstable channel)

Testing web-platform-tests at revision 72ed061
Using browser at version 58.0.3029.6 dev
Starting 10 test iterations
All results were stable

All results

1 test ran

/dom/nodes/Node-lookupNamespaceURI.html

Subtest	Results	Messages
	OK
DocumentFragment should have null namespace, prefix null	PASS
DocumentFragment should have null namespace, prefix ""	PASS
DocumentFragment should have null namespace, prefix "foo"	PASS
DocumentFragment should have null namespace, prefix "xmlns"	PASS
DocumentFragment is in default namespace, prefix null	FAIL	assert_equals: expected true but got false
DocumentFragment is in default namespace, prefix ""	FAIL	assert_equals: expected true but got false
DocumentFragment is in default namespace, prefix "foo"	PASS
DocumentFragment is in default namespace, prefix "xmlns"	PASS
DocumentType should have null nemspace, prefix null	PASS
DocumentType should have null namespace, prefix ""	PASS
DocumentType should have null namespace, prefix "foo"	PASS
DocumentType should have null namespace, prefix "xmlns"	PASS
DocumentType is in default namespace, prefix null	FAIL	assert_equals: expected true but got false
DocumentType is in default namespace, prefix ""	FAIL	assert_equals: expected true but got false
DocumentType is in default namespace, prefix "foo"	PASS
DocumentType is in default namespace, prefix "xmlns"	PASS
Element should have null namespace, prefix null	PASS
Element should have null namespace, prefix ""	PASS
Element should not have namespace matching prefix with namespaceURI value	PASS
Element should not have XMLNS namespace	PASS
Element has namespace URI matching prefix	PASS
Empty namespace is not default, prefix null	FAIL	assert_equals: expected true but got false
Empty namespace is not default, prefix ""	FAIL	assert_equals: expected true but got false
fooNamespace is not default	PASS
xmlns namespace is not default	PASS
Element should have baz namespace, prefix null	PASS
Element should have baz namespace, prefix ""	FAIL	assert_equals: expected (string) "bazURI" but got (object) null
Element does not has namespace with xlmns prefix	PASS
Element has bar namespace	PASS
Empty namespace is not default on fooElem, prefix null	PASS
Empty namespace is not default on fooElem, prefix ""	PASS
bar namespace is not default	PASS
baz namespace is default	PASS
Comment should inherit baz namespace	PASS
Comment should inherit baz namespace	FAIL	assert_equals: expected (string) "bazURI" but got (object) null
Comment should inherit namespace URI matching prefix	PASS
Comment should inherit bar namespace	PASS
For comment, empty namespace is not default, prefix null	PASS
For comment, empty namespace is not default, prefix ""	PASS
For comment, fooNamespace is not default	PASS
For comment, xmlns namespace is not default	PASS
For comment, inherited bar namespace is not default	PASS
For comment, inherited baz namespace is default	PASS
Child element should inherit baz namespace	PASS
Child element should have null namespace	FAIL	assert_equals: expected (string) "childNamespace" but got (object) null
Child element should not have XMLNS namespace	PASS
Child element has namespace URI matching prefix	PASS
Empty namespace is not default for child, prefix null	PASS
Empty namespace is not default for child, prefix ""	PASS
fooNamespace is not default for child	PASS
xmlns namespace is not default for child	PASS
bar namespace is not default for child	PASS
baz namespace is default for child	PASS
childNamespace is default for child	PASS
Document should have xhtml namespace, prefix null	PASS
Document should have xhtml namespace, prefix ""	FAIL	assert_equals: expected (string) "http://www.w3.org/1999/xhtml" but got (object) null
Document has no namespace URI matching prefix	PASS
Document has bar namespace	PASS
For document, empty namespace is not default, prefix null	PASS
For document, empty namespace is not default, prefix ""	PASS
For document, fooNamespace is not default	PASS
For document, xmlns namespace is not default	PASS
For document, bar namespace is not default	PASS
For document, baz namespace is not default	PASS
For document, xhtml namespace is default	PASS
Comment does not have bar namespace	PASS