Introduce a SVGUnknownElement class for unknown SVG elements

Source/core/svg/SVGMetadataElement.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 13 matching lines @@
 #include "core/svg/SVGElement.h"
 
 namespace WebCore {
 
 class SVGMetadataElement FINAL : public SVGElement {
 public:
     static PassRefPtr<SVGMetadataElement> create(const QualifiedName&, Document*);
 
 private:
     SVGMetadataElement(const QualifiedName&, Document*);
+
+    virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE { return false; }
 };
 
 } // namespace WebCore
 
 #endif