Oilpan: cleanup based on review comments after removal of TreeShared.

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 1303 matching lines @@
 
     DocumentClassFlags m_documentClasses;
 
     bool m_isViewSource;
     bool m_sawElementsInKnownNamespaces;
     bool m_isSrcdocDocument;
     bool m_isMobileDocument;
 
     RenderView* m_renderView;
 
+    // FIXME: Oilpan: We should use a real weak pointer here.
     WeakPtrFactory<Document> m_weakFactory;
     WeakPtr<Document> m_contextDocument;
 
     bool m_hasFullscreenElementStack; // For early return in FullscreenElementStack::fromIfExists()
 
     WillBeHeapVector<RefPtrWillBeMember<Element> > m_topLayerElements;
 
     int m_loadEventDelayCount;
     Timer<Document> m_loadEventDelayTimer;
     Timer<Document> m_pluginLoadingTimer;
@@ skipping 32 matching lines @@
 
     typedef HashMap<AtomicString, OwnPtr<Locale> > LocaleIdentifierToLocaleMap;
     LocaleIdentifierToLocaleMap m_localeCache;
 
     AnimationClock m_animationClock;
     RefPtr<DocumentTimeline> m_timeline;
     RefPtr<DocumentTimeline> m_transitionTimeline;
     CompositorPendingAnimations m_compositorPendingAnimations;
 
     RefPtrWillBeMember<Document> m_templateDocument;
-    RawPtrWillBeMember<Document> m_templateDocumentHost; // Manually managed weakref (backpointer from m_templateDocument).
+    // With Oilpan the templateDocument and the templateDocumentHost
+    // live and die together. Without Oilpan, the templateDocumentHost
+    // is a manually managed backpointer from m_templateDocument.
+    RawPtrWillBeMember<Document> m_templateDocumentHost;
 
     Timer<Document> m_didAssociateFormControlsTimer;
     WillBeHeapHashSet<RefPtrWillBeMember<Element> > m_associatedFormControls;
 
     HashSet<SVGUseElement*> m_useElementsNeedingUpdate;
     HashSet<Element*> m_layerUpdateElements;
 
     bool m_hasViewportUnits;
 
     typedef WillBeHeapHashSet<RawPtrWillBeWeakMember<DocumentVisibilityObserver> > DocumentVisibilityObserverSet;
@@ skipping 56 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == document();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h