Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

Source/core/page/DragState.h

 /*
  * Copyright (C) 2011 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "wtf/Noncopyable.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class Clipboard;
 class Node;
 
 class DragState : public NoBaseWillBeGarbageCollectedFinalized<DragState> {
     WTF_MAKE_NONCOPYABLE(DragState);
-    DECLARE_GC_INFO;
 public:
     DragState() { }
     RefPtr<Node> m_dragSrc; // element that may be a drag source, for the current mouse gesture
     DragSourceAction m_dragType;
     RefPtrWillBeMember<Clipboard> m_dragClipboard; // used on only the source side of dragging
 
     void trace(Visitor* visitor)
     {
         visitor->trace(m_dragClipboard);
     }
 };
 
 } // namespace WebCore
 
 #endif // DragState_h