Refactor WebCore::DragImage.

Source/core/platform/chromium/ClipboardChromium.h

 // Copyright (c) 2008, 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 77 matching lines @@
         virtual PassRefPtr<FileList> files() const;
 
         void setDragImage(CachedImage*, const IntPoint&);
         void setDragImageElement(Node*, const IntPoint&);
 
         PassRefPtr<ChromiumDataObject> dataObject()
         {
             return m_dataObject;
         }
 
-        virtual DragImageRef createDragImage(IntPoint& dragLoc) const;
+        virtual PassOwnPtr<DragImage> createDragImage(IntPoint& dragLoc) const;
         virtual void declareAndWriteDragImage(Element*, const KURL&, const String& title, Frame*);
         virtual void writeURL(const KURL&, const String&, Frame*);
         virtual void writeRange(Range*, Frame*);
         virtual void writePlainText(const String&);
 
         virtual bool hasData();
 
         virtual PassRefPtr<DataTransferItemList> items();
         Frame* frame() const { return m_frame; }
 
     private:
         ClipboardChromium(ClipboardType, PassRefPtr<ChromiumDataObject>, ClipboardAccessPolicy, Frame*);
 
         void resetFromClipboard();
         void setDragImage(CachedImage*, Node*, const IntPoint&);
         RefPtr<ChromiumDataObject> m_dataObject;
         Frame* m_frame;
     };
 
 } // namespace WebCore
 
 #endif // ClipboardChromium_h