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

Source/core/html/ImageDocument.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 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 83 matching lines @@
     }
 
     virtual void appendBytes(DocumentWriter*, const char*, size_t);
     virtual void finish();
 };
 
 class ImageDocumentElement : public HTMLImageElement {
 public:
     static PassRefPtr<ImageDocumentElement> create(ImageDocument*);
 
+    void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     // FIXME(oilpan): handlify ImageDocument.
     ImageDocumentElement(ImageDocument* document)
         : HTMLImageElement(imgTag, Handle<Document>(document))
         , m_imageDocument(document)
     {
     }
 
     virtual ~ImageDocumentElement();
     virtual void didMoveToNewDocument(Handle<Document> oldDocument) OVERRIDE;
@@ skipping 265 matching lines @@
     }
 }
 
 bool ImageEventListener::operator==(const EventListener& listener)
 {
     if (const ImageEventListener* imageEventListener = ImageEventListener::cast(&listener))
         return m_doc == imageEventListener->m_doc;
     return false;
 }
 
+void ImageDocument::acceptHeapVisitor(Visitor* visitor) const
+{
+    visitor->visit(m_imageElement);
+    HTMLDocument::acceptHeapVisitor(visitor);
+}
+
 // --------
 
 ImageDocumentElement::~ImageDocumentElement()
 {
     if (m_imageDocument)
         m_imageDocument->disconnectImageElement();
 }
 
 void ImageDocumentElement::didMoveToNewDocument(Handle<Document> oldDocument)
 {
     if (m_imageDocument) {
         m_imageDocument->disconnectImageElement();
         m_imageDocument = 0;
     }
     HTMLImageElement::didMoveToNewDocument(oldDocument);
 }
 
+void ImageDocumentElement::acceptHeapVisitor(Visitor* visitor) const
+{
+    HTMLImageElement::acceptHeapVisitor(visitor);
 }
+
+}