InlinedVisitor: Migrate dom to use inlined tracing

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
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 40 matching lines @@
 
     UserActionElementSet();
     ~UserActionElementSet();
 
     void didDetach(Node*);
 
 #if !ENABLE(OILPAN)
     void documentDidRemoveLastRef();
 #endif
 
-    void trace(Visitor*);
+    DECLARE_TRACE();
 
 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 WillBeHeapHashMap<RefPtrWillBeMember<Element>, unsigned> ElementFlagMap;
     ElementFlagMap m_elements;
 };
 
 } // namespace
 
 #endif // UserActionElementSet_h