Reviewed by Sam Weinig.

* accessibility/AXObjectCache.cpp:
(WebCore::AXObjectCache::AXObjectCache):

* accessibility/AXObjectCache.h:
Remove the Document argument to the AXObjectCache constructor and the
m_document member variable, and replace the no-parameter
handleFocusedUIElementChanged() with the two-parameter GTK function.
(WebCore::AXObjectCache::handleFocusedUIElementChanged):

* accessibility/chromium/AXObjectCacheChromium.cpp:
(WebCore::AXObjectCache::handleFocusedUIElementChanged):

* accessibility/gtk/AXObjectCacheAtk.cpp:
(WebCore::AXObjectCache::handleFocusedUIElementChanged):

* accessibility/gtk/AccessibilityObjectWrapperAtk.cpp:
(fallbackObject):
Don't pass a null Document when constructing the AXObjectCache.

* accessibility/mac/AXObjectCacheMac.mm:
(WebCore::AXObjectCache::handleFocusedUIElementChanged):

* accessibility/win/AXObjectCacheWin.cpp:
(WebCore::AXObjectCache::handleFocusedUIElementChanged):
Get the document from the RenderObject; m_document was removed.

* dom/Document.cpp:
(WebCore::Document::axObjectCache):
Don't pass the Document when constructing the AXObjectCache.
(WebCore::Document::setFocusedNode):
Pass the old and new focused RenderObjects when calling
handleFocusedUIElementChanged().

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@47946 268f45cc-cd09-0410-ab3c-d52691b4dbfc