Reduce repetitive EventTarget subclassing

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 2086 matching lines @@
 {
     DEFINE_STATIC_LOCAL(EventTargetDataMap, map, ());
     return map;
 }
 
 EventTargetData* Node::eventTargetData()
 {
     return hasEventTargetData() ? eventTargetDataMap().get(this) : 0;
 }
 
-EventTargetData* Node::ensureEventTargetData()
+EventTargetData& Node::ensureEventTargetData()
 {
     if (hasEventTargetData())
-        return eventTargetDataMap().get(this);
+        return *eventTargetDataMap().get(this);
     setHasEventTargetData(true);
     EventTargetData* data = new EventTargetData;
     eventTargetDataMap().set(this, adoptPtr(data));
-    return data;
+    return *data;
 }
 
 void Node::clearEventTargetData()
 {
     eventTargetDataMap().remove(this);
 }
 
 Vector<OwnPtr<MutationObserverRegistration> >* Node::mutationObserverRegistry()
 {
     if (!hasRareData())
@@ skipping 507 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif