Oilpan: use transition types for remaining RefPtr<Document>s in dom/.

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 1228 matching lines @@
     RefPtrWillBeMember<Element> m_focusedElement;
     RefPtrWillBeMember<Node> m_hoverNode;
     RefPtrWillBeMember<Element> m_activeHoverElement;
     RefPtrWillBeMember<Element> m_documentElement;
     UserActionElementSet m_userActionElements;
 
     uint64_t m_domTreeVersion;
     static uint64_t s_globalTreeVersion;
 
     WillBeHeapHashSet<RawPtrWillBeWeakMember<NodeIterator> > m_nodeIterators;
-    HashSet<Range*> m_ranges;
+    typedef WillBeHeapHashSet<RawPtrWillBeWeakMember<Range> > AttachedRangeSet;
+    AttachedRangeSet m_ranges;
 
     unsigned short m_listenerTypes;
 
     MutationObserverOptions m_mutationObserverTypes;
 
     OwnPtrWillBeMember<StyleEngine> m_styleEngine;
     RefPtrWillBeMember<StyleSheetList> m_styleSheetList;
 
     OwnPtrWillBeMember<FormController> m_formController;
 
@@ skipping 190 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == document();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h