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

Source/core/svg/SVGFEMergeElement.h

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 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 13 matching lines @@
 #if ENABLE(SVG)
 #include "core/platform/graphics/filters/FEMerge.h"
 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
 
 namespace WebCore {
 
 class SVGFEMergeElement : public SVGFilterPrimitiveStandardAttributes {
 public:
     static PassRefPtr<SVGFEMergeElement> create(const QualifiedName&, const Handle<Document>&);
 
+    virtual void accept(Visitor* visitor) const OVERRIDE { SVGFilterPrimitiveStandardAttributes::accept(visitor); }
+
 private:
     SVGFEMergeElement(const QualifiedName&, const Handle<Document>&);
 
     virtual PassRefPtr<FilterEffect> build(SVGFilterBuilder*, Filter*);
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG)
 #endif