Enable Oilpan for core/clipboard/

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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DragState_h
 #define DragState_h
 
 #include "core/page/DragActions.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class DataTransfer;
 class Node;
 
-class DragState : public NoBaseWillBeGarbageCollected<DragState> {
+// TODO(Oilpan): when Node is always on the heap, just derive from GarbageCollected<>.
+class DragState final : public GarbageCollectedFinalized<DragState> {
     WTF_MAKE_NONCOPYABLE(DragState);
 public:
     DragState() { }
 
     RefPtrWillBeMember<Node> m_dragSrc; // element that may be a drag source, for the current mouse gesture
     DragSourceAction m_dragType;
-    RefPtrWillBeMember<DataTransfer> m_dragDataTransfer; // used on only the source side of dragging
+    Member<DataTransfer> m_dragDataTransfer; // used on only the source side of dragging
 
     DEFINE_INLINE_TRACE()
     {
         visitor->trace(m_dragSrc);
         visitor->trace(m_dragDataTransfer);
     }
 };
 
 } // namespace blink
 
 #endif // DragState_h