Revert 146726 "AXObjectCache gets recreated during document tear..."

Source/WebCore/page/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 681 matching lines @@
         page()->scrollingCoordinator()->willDestroyScrollableArea(m_view.get());
 
     script()->clearScriptObjects();
     script()->updatePlatformScriptObjects();
 }
 
 void Frame::disconnectOwnerElement()
 {
     if (m_ownerElement) {
         if (Document* doc = document())
-            doc->topDocument()->clearAXObjectCache();
+            doc->clearAXObjectCache();
         m_ownerElement->clearContentFrame();
         if (m_page)
             m_page->decrementSubframeCount();
     }
     m_ownerElement = 0;
 }
 
 String Frame::documentTypeString() const
 {
     if (DocumentType* doctype = document()->doctype())
@@ skipping 422 matching lines @@
 
     m_view->paintContents(buffer->context(), paintingRect);
 
     RefPtr<Image> image = buffer->copyImage();
     return createDragImageFromImage(image.get());
 }
 
 #endif
 
 } // namespace WebCore