Oilpan: move RenderObjects off heap.

Source/core/dom/NodeRareData.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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 struct SameSizeAsNodeRareData {
     void* m_pointer[2];
     OwnPtrWillBeMember<NodeMutationObserverData> m_mutationObserverData;
     unsigned m_bitfields;
 };
 
 static_assert(sizeof(NodeRareData) == sizeof(SameSizeAsNodeRareData), "NodeRareData should stay small");
 
 void NodeRareData::traceAfterDispatch(Visitor* visitor)
 {
-#if ENABLE(OILPAN)
-    visitor->trace(m_renderer);
-#endif
     visitor->trace(m_mutationObserverData);
     // Do not keep empty NodeListsNodeData objects around.
     if (m_nodeLists && m_nodeLists->isEmpty())
         m_nodeLists.clear();
     else
         visitor->trace(m_nodeLists);
 }
 
 void NodeRareData::trace(Visitor* visitor)
 {
     if (m_isElementRareData)
         static_cast<ElementRareData*>(this)->traceAfterDispatch(visitor);
     else
         traceAfterDispatch(visitor);
 }
 
 void NodeRareData::finalizeGarbageCollectedObject()
 {
     RELEASE_ASSERT(!renderer());
     if (m_isElementRareData)
         static_cast<ElementRareData*>(this)->~ElementRareData();
     else
         this->~NodeRareData();
 }
 
 // Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
 static_assert(FrameHost::maxNumberOfFrames < (1 << NodeRareData::ConnectedFrameCountBits), "Frame limit should fit in rare data count");
 
 } // namespace blink