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

Source/core/html/HTMLTemplateElement.h

 /*
  * Copyright (c) 2012, 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 25 matching lines @@
 
 namespace WebCore {
 
 class HTMLTemplateElement : public HTMLElement {
 public:
     static PassRefPtr<HTMLTemplateElement> create(const QualifiedName&, Handle<Document>);
     virtual ~HTMLTemplateElement();
 
     DocumentFragment* content() const;
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     virtual PassRefPtr<Node> cloneNode(bool deep) OVERRIDE;
     virtual void didMoveToNewDocument(Handle<Document> oldDocument) OVERRIDE;
 
     HTMLTemplateElement(const QualifiedName&, Handle<Document>);
 
-    mutable RefPtr<DocumentFragment> m_content;
+    mutable Member<DocumentFragment> m_content;
 };
 
 const HTMLTemplateElement* toHTMLTemplateElement(const Node*);
 
 inline HTMLTemplateElement* toHTMLTemplateElement(Node* node)
 {
     return const_cast<HTMLTemplateElement*>(toHTMLTemplateElement(static_cast<const Node*>(node)));
 }
 
 #ifdef NDEBUG
 
 // The debug version of this, with assertions, is not inlined.
 inline const HTMLTemplateElement* toHTMLTemplateElement(const Node* node)
 {
     return static_cast<const HTMLTemplateElement*>(node);
 }
 #endif // NDEBUG
 
 } // namespace WebCore
 
 #endif // HTMLTemplateElement_h