Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/dom/NodeRenderingTraversal.cpp

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 227 matching lines @@
         if (renderer && !isRendererReparented(renderer))
             return renderer;
     }
     return 0;
 }
 
 RenderObject* nextInTopLayer(const Element* element)
 {
     if (!element->isInTopLayer())
         return 0;
-    const Vector<RefPtr<Element> >& topLayerElements = element->document().topLayerElements();
+    const WillBeHeapVector<RefPtrWillBeMember<Element> >& topLayerElements = element->document().topLayerElements();
     size_t position = topLayerElements.find(element);
     ASSERT(position != kNotFound);
     for (size_t i = position + 1; i < topLayerElements.size(); ++i) {
         if (RenderObject* renderer = topLayerElements[i]->renderer())
             return renderer;
     }
     return 0;
 }
 
 }
 
 } // namespace