https://bugs.webkit.org/show_bug.cgi?id=87409

Reviewed by Abhishek Arya.

Source/WebCore:

Use Node::rendererIsEditable everywhere rather than
Node::isContentEditable because the latter can trigger a layout
and destroy the renderer. New test covers the change to
AccessibilityTable.cpp, changes to AccessibilityRenderObject.cpp
are covered by existing tests.

Test: accessibility/contenteditable-table-check-causes-crash.html

* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::isReadOnly):
(WebCore::AccessibilityRenderObject::contentChanged):
* accessibility/AccessibilityTable.cpp:
(WebCore::AccessibilityTable::isDataTable):

LayoutTests:

* accessibility/contenteditable-table-check-causes-crash-expected.txt: Added.
* accessibility/contenteditable-table-check-causes-crash.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@118478 268f45cc-cd09-0410-ab3c-d52691b4dbfc