Get rid of of custom code for Clipboard.setDragImage()

Source/core/dom/Clipboard.h

Index: Source/core/dom/Clipboard.h
diff --git a/Source/core/dom/Clipboard.h b/Source/core/dom/Clipboard.h
index 6031d3b2abe04a9470b4cf1122d9261e8e4462f2..dfe22710e7643811e229de083cdc141da673e1a7 100644
--- a/Source/core/dom/Clipboard.h
+++ b/Source/core/dom/Clipboard.h
@@ -40,6 +40,7 @@ class ChromiumDataObject;
 class DataTransferItemList;
 class DragImage;
 class Element;
+class ExceptionState;
 class FileList;
 class Frame;
 class ImageResource;
@@ -76,8 +77,9 @@ public:
     PassRefPtr<FileList> files() const;
 
     IntPoint dragLocation() const { return m_dragLoc; }
-    ImageResource* dragImage() const { return m_dragImage.get(); }
-    void setDragImage(ImageResource*, const IntPoint&);
+    void setDragImage(Element*, int x, int y, ExceptionState&);
+    ImageResource* dragImageResource() const { return m_dragImage.get(); }
+    void setDragImageResource(ImageResource*, const IntPoint&);
     Node* dragImageElement() const { return m_dragImageElement.get(); }
     void setDragImageElement(Node*, const IntPoint&);