Revert 114283 - Avoid using backing store for compositing layers that just need to clip

Source/WebCore/rendering/RenderView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 237 matching lines @@
     // a transform, transparency layer, etc.
     Element* elt;
     for (elt = document()->ownerElement(); view() && elt && elt->renderer(); elt = elt->document()->ownerElement()) {
         RenderLayer* layer = elt->renderer()->enclosingLayer();
         if (layer->cannotBlitToWindow()) {
             frameView()->setCannotBlitToWindow();
             break;
         }
 
 #if USE(ACCELERATED_COMPOSITING)
-        if (RenderLayer* compositingLayer = layer->enclosingCompositingLayerForRepaint()) {
+        if (RenderLayer* compositingLayer = layer->enclosingCompositingLayer()) {
             if (!compositingLayer->backing()->paintsIntoWindow()) {
                 frameView()->setCannotBlitToWindow();
                 break;
             }
         }
 #endif
     }
 
     if (document()->ownerElement() || !view())
         return;
@@ skipping 676 matching lines @@
 
 void RenderView::removeFixedPositionedObject(RenderBox* object)
 {
     if (!m_positionedObjects)
         return;
 
     m_positionedObjects->remove(object);
 }
 
 } // namespace WebCore