[oilpan]: Move ElementDataCache to the oilpan heap using transition types.

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 1335 matching lines @@
     RefPtrWillBeMember<ScriptedAnimationController> m_scriptedAnimationController;
     OwnPtr<MainThreadTaskRunner> m_taskRunner;
     OwnPtr<TextAutosizer> m_textAutosizer;
     OwnPtr<FastTextAutosizer> m_fastTextAutosizer;
 
     RefPtrWillBeMember<CustomElementRegistrationContext> m_registrationContext;
 
     void elementDataCacheClearTimerFired(Timer<Document>*);
     Timer<Document> m_elementDataCacheClearTimer;
 
-    OwnPtr<ElementDataCache> m_elementDataCache;
+    OwnPtrWillBeMember<ElementDataCache> m_elementDataCache;
 
 #ifndef NDEBUG
     bool m_didDispatchViewportPropertiesChanged;
 #endif
 
     typedef HashMap<AtomicString, OwnPtr<Locale> > LocaleIdentifierToLocaleMap;
     LocaleIdentifierToLocaleMap m_localeCache;
 
     AnimationClock m_animationClock;
     RefPtrWillBeMember<AnimationTimeline> m_timeline;
@@ skipping 56 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == document();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h