[oilpan] Implement accept methods to trace the class hierarchy of SVGElement and all sub-classes.

Source/core/svg/SVGDescElement.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  *
  * 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,
@@ skipping 16 matching lines @@
 
 namespace WebCore {
 
 class SVGDescElement : public SVGStyledElement,
                        public SVGLangSpace {
 public:
     static PassRefPtr<SVGDescElement> create(const QualifiedName&, const Handle<Document>&);
 
     String description() const;
 
+    virtual void accept(Visitor* visitor) const OVERRIDE { SVGStyledElement::accept(visitor); }
+
 private:
     SVGDescElement(const QualifiedName&, const Handle<Document>&);
 
     virtual bool rendererIsNeeded(const NodeRenderingContext&) { return false; }
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG)
 #endif