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

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 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
@@ skipping 636 matching lines @@
     virtual short tabIndex() const OVERRIDE;
 
     PassRefPtr<HTMLCollection> ensureCachedHTMLCollection(CollectionType);
     HTMLCollection* cachedHTMLCollection(CollectionType);
 
     // classAttributeChanged() exists to share code between
     // parseAttribute (called via setAttribute()) and
     // svgAttributeChanged (called when element.className.baseValue is set)
     void classAttributeChanged(const AtomicString& newClassString);
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     void updatePseudoElement(PseudoId, StyleChange);
     void createPseudoElementIfNeeded(PseudoId);
     void setPseudoElement(PseudoId, PassRefPtr<PseudoElement>);
 
     virtual bool areAuthorShadowsAllowed() const { return true; }
     virtual void didAddUserAgentShadowRoot(ShadowRoot*) { }
     virtual bool alwaysCreateUserAgentShadowRoot() const { return false; }
 
     // FIXME: Remove the need for Attr to call willModifyAttribute/didModifyAttribute.
@@ skipping 357 matching lines @@
 
 inline const Attribute* ElementData::attributeItem(unsigned index) const
 {
     RELEASE_ASSERT(index < length());
     return attributeBase() + index;
 }
 
 } // namespace
 
 #endif