Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/dom/UserActionElementSet.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
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  * notice, this list of conditions and the following disclaimer.
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  * contributors may be used to endorse or promote products derived from
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  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 #ifndef UserActionElementSet_h
 #define UserActionElementSet_h
 
+#include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class Node;
 class Element;
 
-class UserActionElementSet {
+class UserActionElementSet FINAL {
+    DISALLOW_ALLOCATION();
 public:
-    static PassOwnPtr<UserActionElementSet> create() { return adoptPtr(new UserActionElementSet()); }
-
     bool isFocused(const Node* node) { return hasFlags(node, IsFocusedFlag); }
     bool isActive(const Node* node) { return hasFlags(node, IsActiveFlag); }
     bool isInActiveChain(const Node* node) { return hasFlags(node, InActiveChainFlag); }
     bool isHovered(const Node* node) { return hasFlags(node, IsHoveredFlag); }
     void setFocused(Node* node, bool enable) { setFlags(node, enable, IsFocusedFlag); }
     void setActive(Node* node, bool enable) { setFlags(node, enable, IsActiveFlag); }
     void setInActiveChain(Node* node, bool enable) { setFlags(node, enable, InActiveChainFlag); }
     void setHovered(Node* node, bool enable) { setFlags(node, enable, IsHoveredFlag); }
 
     UserActionElementSet();
     ~UserActionElementSet();
 
     void didDetach(Node*);
+
+#if !ENABLE(OILPAN)
     void documentDidRemoveLastRef();
+#endif
+
+    void trace(Visitor*);
 
 private:
     enum ElementFlags {
         IsActiveFlag      = 1 ,
         InActiveChainFlag = 1 << 1,
         IsHoveredFlag     = 1 << 2,
         IsFocusedFlag     = 1 << 3
     };
 
     void setFlags(Node* node, bool enable, unsigned flags) { enable ? setFlags(node, flags) : clearFlags(node, flags); }
     void setFlags(Node*, unsigned);
     void clearFlags(Node*, unsigned);
     bool hasFlags(const Node*, unsigned flags) const;
 
     void setFlags(Element*, unsigned);
     void clearFlags(Element*, unsigned);
     bool hasFlags(const Element*, unsigned flags) const;
 
-    typedef HashMap<RefPtr<Element>, unsigned> ElementFlagMap;
+    typedef WillBeHeapHashMap<RefPtrWillBeMember<Element>, unsigned> ElementFlagMap;
     ElementFlagMap m_elements;
 };
 
 } // namespace
 
 #endif // UserActionElementSet_h