Move LayoutObject to satellite NodeLayoutData that hangs from a Node.

third_party/WebKit/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 21 matching lines @@
 
 #include "bindings/core/v8/ScriptWrappableVisitor.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementRareData.h"
 #include "core/page/Page.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 struct SameSizeAsNodeRareData {
-  void* pointer_;
   Member<void*> willbe_member_[2];
   unsigned bitfields_;
 };
 
 static_assert(sizeof(NodeRareData) == sizeof(SameSizeAsNodeRareData),
               "NodeRareData should stay small");
 
 DEFINE_TRACE_AFTER_DISPATCH(NodeRareData) {
   visitor->Trace(mutation_observer_data_);
   // Do not keep empty NodeListsNodeData objects around.
@@ skipping 17 matching lines @@
   else
     TraceWrappersAfterDispatch(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS_AFTER_DISPATCH(NodeRareData) {
   visitor->TraceWrappersWithManualWriteBarrier(node_lists_);
   visitor->TraceWrappersWithManualWriteBarrier(mutation_observer_data_);
 }
 
 void NodeRareData::FinalizeGarbageCollectedObject() {
-  CHECK(!GetLayoutObject());
   if (is_element_rare_data_)
     static_cast<ElementRareData*>(this)->~ElementRareData();
   else
     this->~NodeRareData();
 }
 
 void NodeRareData::IncrementConnectedSubframeCount() {
   SECURITY_CHECK((connected_frame_count_ + 1) <= Page::kMaxNumberOfFrames);
   ++connected_frame_count_;
 }
 
 // Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
 static_assert(Page::kMaxNumberOfFrames <
                   (1 << NodeRareData::kConnectedFrameCountBits),
               "Frame limit should fit in rare data count");
 
 }  // namespace blink