Have NodeRareData's ensureNodeLists() / ensureMutationObserverData() return a reference

Source/core/dom/NodeRareData.h

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith <catfish.man@gmail.com>
  *
  * 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 231 matching lines @@
     NodeMutationObserverData() { }
 };
 
 class NodeRareData : public NodeRareDataBase {
     WTF_MAKE_NONCOPYABLE(NodeRareData); WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<NodeRareData> create(RenderObject* renderer) { return adoptPtr(new NodeRareData(renderer)); }
 
     void clearNodeLists() { m_nodeLists.clear(); }
     NodeListsNodeData* nodeLists() const { return m_nodeLists.get(); }
-    NodeListsNodeData* ensureNodeLists()
+    NodeListsNodeData& ensureNodeLists()
     {
         if (!m_nodeLists)
             m_nodeLists = NodeListsNodeData::create();
-        return m_nodeLists.get();
+        return *m_nodeLists;
     }
 
     NodeMutationObserverData* mutationObserverData() { return m_mutationObserverData.get(); }
-    NodeMutationObserverData* ensureMutationObserverData()
+    NodeMutationObserverData& ensureMutationObserverData()
     {
         if (!m_mutationObserverData)
             m_mutationObserverData = NodeMutationObserverData::create();
-        return m_mutationObserverData.get();
+        return *m_mutationObserverData;
     }
 
     unsigned connectedSubframeCount() const { return m_connectedFrameCount; }
     void incrementConnectedSubframeCount(unsigned amount)
     {
         m_connectedFrameCount += amount;
     }
     void decrementConnectedSubframeCount(unsigned amount)
     {
         ASSERT(m_connectedFrameCount);
@@ skipping 23 matching lines @@
     ownerNode->clearNodeLists();
     return true;
 }
 
 // Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
 COMPILE_ASSERT(Page::maxNumberOfFrames < 1024, Frame_limit_should_fit_in_rare_data_count);
 
 } // namespace WebCore
 
 #endif // NodeRareData_h