Move Document pointer from Frame to LocalFrame.

Source/core/accessibility/AXObjectCache.cpp

 /*
  * Copyright (C) 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 143 matching lines @@
     }
 
     return 0;
 }
 
 AXObject* AXObjectCache::focusedUIElementForPage(const Page* page)
 {
     if (!gAccessibilityEnabled)
         return 0;
 
+    // Cross-process accessibility is not yet implemented.
+    if (!page->focusController().focusedOrMainFrame()->isLocalFrame())
+        return 0;
+
     // get the focused node in the page
-    Document* focusedDocument = page->focusController().focusedOrMainFrame()->document();
+    Document* focusedDocument = toLocalFrame(page->focusController().focusedOrMainFrame())->document();
     Node* focusedNode = focusedDocument->focusedElement();
     if (!focusedNode)
         focusedNode = focusedDocument;
 
     if (isHTMLAreaElement(*focusedNode))
         return focusedImageMapUIElement(toHTMLAreaElement(focusedNode));
 
     AXObject* obj = focusedNode->document().axObjectCache()->getOrCreate(focusedNode);
     if (!obj)
         return 0;
@@ skipping 887 matching lines @@
 {
     postPlatformNotification(getOrCreate(scrollView), AXScrollPositionChanged);
 }
 
 void AXObjectCache::handleScrollPositionChanged(RenderObject* renderObject)
 {
     postPlatformNotification(getOrCreate(renderObject), AXScrollPositionChanged);
 }
 
 } // namespace WebCore