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

Source/core/html/HTMLBaseElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 16 matching lines @@
 
 namespace WebCore {
 
 class HTMLBaseElement : public HTMLElement {
 public:
     static Result<HTMLBaseElement> create(const QualifiedName&, Handle<Document>);
 
     KURL href() const;
     void setHref(const AtomicString&);
 
-    virtual void acceptHeapVisitor(Visitor* visitor) const { HTMLElement::acceptHeapVisitor(visitor); }
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
 
 private:
     HTMLBaseElement(const QualifiedName&, Handle<Document>);
 
     virtual String target() const;
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
 };
 
 } // namespace
 
 #endif