https://bugs.webkit.org/show_bug.cgi?id=126970

Reviewed by Gustavo Noronha Silva.

Source/WebCore:

Remove code that is causing a huge performance problem when
loading big pages, just to be able to emit the children-changed:add
signal at the exact time a child is added.

This removal does not imply that the signal won't be ever emitted,
just that it will be emitted a bit later (when the new child is
asynchronously added to the tree), which should be good enough
anyway for Accessible Technologies, without impacting perfformance
in such a negative way.

* accessibility/atk/AXObjectCacheAtk.cpp:
(WebCore::AXObjectCache::postPlatformNotification): Removed
extremely expensive referring loop when AXChildrenChanged is received.

LayoutTests:

Because of the removal of the referring test when
AXChildrenChanged is received, the children-changed:add signal is
now emitted later, so we need to reorder the expectations.

* accessibility/children-changed-sends-notification-expected.txt: Updated.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161966 268f45cc-cd09-0410-ab3c-d52691b4dbfc