include RefCounted.h where needed, only.

third_party/WebKit/Source/core/clipboard/DataTransferItem.h

 /*
  * Copyright (C) 2011 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DataTransferItem_h
 #define DataTransferItem_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
-#include "wtf/RefCounted.h"
-#include "wtf/RefPtr.h"
 
 namespace blink {
 
 class Blob;
 class DataObjectItem;
 class DataTransfer;
 class StringCallback;
 class ExecutionContext;
 
 class CORE_EXPORT DataTransferItem final : public GarbageCollected<DataTransferItem>, public ScriptWrappable {
@@ skipping 16 matching lines @@
 private:
     DataTransferItem(DataTransfer*, DataObjectItem*);
 
     Member<DataTransfer> m_dataTransfer;
     Member<DataObjectItem> m_item;
 };
 
 } // namespace blink
 
 #endif // DataTransferItem_h