Bug 24143: Crash occurs at WebCore::AccessibilityTable::isTableExposableThroughAccessibility() when applying a link in GMail
https://bugs.webkit.org/show_bug.cgi?id=24143
When an AX object is marked dirty, do not create AX elements while going up the parent chain.
Do not allow AXRenderObjects to remove their own IDs from the cache, all the cache to do that work
Make sure the AXObjectWrapper's have an object before calling them
In AXObjectCache, change get -> getOrCreate. Use get() to only retrieve an element if it exists
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@41236
268f45cc-cd09-0410-ab3c-
d52691b4dbfc