XMLSerializer-attribute-namespace-prefix-conflicts can't produce reliable results
https://bugs.webkit.org/show_bug.cgi?id=120490

Reviewed by Ryosuke Niwa.

Source/WebCore:

Retain the key of the namespaces map by using AtomicString as key instead of AtomicStringImpl*.

* editing/MarkupAccumulator.h:

LayoutTests:

Unskip these previously failing tests.

* TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154932 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Fix typo in r154931 that caused assertions in continuation tests.

* rendering/InlineFlowBox.cpp:
(WebCore::InlineFlowBox::paint):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154933 268f45cc-cd09-0410-ab3c-d52691b4dbfc