Make Resource RefCountedWillBeGarbageCollectedFinalized, attempt #2

third_party/WebKit/Source/core/clipboard/DataTransfer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple 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:
  * 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 212 matching lines @@
         setDragImageResource(toHTMLImageElement(*image).cachedImage(), location);
     else
         setDragImageElement(image, location);
 }
 
 void DataTransfer::clearDragImage()
 {
     if (!canSetDragImage())
         return;
 
-    m_dragImage = 0;
+    m_dragImage = nullptr;
     m_dragLoc = IntPoint();
     m_dragImageElement = nullptr;
 }
 
 void DataTransfer::setDragImageResource(ImageResource* img, const IntPoint& loc)
 {
     setDragImage(img, 0, loc);
 }
 
 void DataTransfer::setDragImageElement(Node* node, const IntPoint& loc)
@@ skipping 262 matching lines @@
     case DragOperationLink:
         return String("link");
     default:
         return String("copy");
     }
 }
 
 DEFINE_TRACE(DataTransfer)
 {
     visitor->trace(m_dataObject);
+    visitor->trace(m_dragImage);
 #if ENABLE(OILPAN)
     visitor->trace(m_dragImageElement);
 #endif
 }
 
 } // namespace blink