https://bugs.webkit.org/show_bug.cgi?id=72811

Part of the bug was due to extraneous accessible objects resulting
from unignored inline and block spans.

Patch by Joanmarie Diggs <jdiggs@igalia.com> on 2012-09-01
Reviewed by Chris Fleizach.

Source/WebCore: 

Test: platform/gtk/accessibility/spans.html

* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::accessibilityIsIgnored): Ignore objects that have spanTag tag name.
* accessibility/gtk/AccessibilityObjectAtk.cpp:
(WebCore::AccessibilityObject::accessibilityPlatformIncludesObject): Ignore most anonymous blocks.
* accessibility/gtk/WebKitAccessibleWrapperAtk.cpp:
(roleIsTextType): Add ListItem to the roles which should implement AtkText.

LayoutTests: 

Added new test, updated the results of one test to reflect the fix,
corrected a test with a mismatched element tag.

* platform/gtk/accessibility/aria-roles-unignored-expected.txt: Corrected results having fixed tag.
* platform/gtk/accessibility/aria-roles-unignored.html: Fixed mismatched element tag.
* platform/gtk/accessibility/media-element-expected.txt: Updated to reflect removal of extraneous object.
* platform/gtk/accessibility/spans-expected.txt: Added.
* platform/gtk/accessibility/spans.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@127368 268f45cc-cd09-0410-ab3c-d52691b4dbfc