[oilpan] The Node hierarchy should have correct accept method chains

Source/core/html/ImageDocument.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 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 29 matching lines @@
     }
 
     CachedImage* cachedImage();
     ImageDocumentElement* imageElement() const { return m_imageElement; }
     void disconnectImageElement() { m_imageElement = 0; }
     
     void windowSizeChanged();
     void imageUpdated();
     void imageClicked(int x, int y);
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     ImageDocument(Frame*, const KURL&);
 
     virtual PassRefPtr<DocumentParser> createParser();
     virtual bool isImageDocument() const { return true; }
     
     void createDocumentStructure();
     void resizeImageToFit();
     void restoreImageSize();
     bool imageFitsInWindow() const;
@@ skipping 33 matching lines @@
 {
     return toImageDocument(Handle<const Document>(document));
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toImageDocument(const ImageDocument*);
 
 }
 
 #endif // ImageDocument_h