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

Source/core/html/HTMLBDIElement.h

 /*
  * Copyright (C) 2012 Google 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 14 matching lines @@
 
 namespace WebCore {
 
 class HTMLBDIElement : public HTMLElement {
 public:
     static Result<HTMLBDIElement> create(const QualifiedName& name, Handle<Document> document)
     {
         return adoptTreeShared(new HTMLBDIElement(name, document));
     }
 
-    virtual void acceptHeapVisitor(Visitor* visitor) const { HTMLElement::acceptHeapVisitor(visitor); }
+    void acceptHeapVisitor(Visitor* visitor) const OVERRIDE
+    {
+        HTMLElement::acceptHeapVisitor(visitor);
+    }
 
 private:
     HTMLBDIElement(const QualifiedName& name, Handle<Document> document)
         : HTMLElement(name, document)
     {
         // FIXME: Rename setSelfOrAncestorHasDirAutoAttribute to reflect the fact bdi also uses this flag.
         setSelfOrAncestorHasDirAutoAttribute(true);
     }
 };
 
 } // namespace WebCore
 
 #endif