Update SVG classes to use OVERRIDE / FINAL when needed

Source/core/svg/SVGUnknownElement.h

 /*
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 #include "core/svg/SVGElement.h"
 
 namespace WebCore {
 
 // This type is used for 2 kinds of elements:
 // - Unknown Elements in SVG namespace
 // - Registered custom tag elements in SVG namespace (http://www.w3.org/TR/2013/WD-custom-elements-20130514/#registering-custom-elements)
 //
 // The main purpose of this class at the moment is to override rendererIsNeeded() to return
 // false to make sure we don't attempt to render such elements.
-class SVGUnknownElement : public SVGElement {
+class SVGUnknownElement FINAL : public SVGElement {
 public:
     static PassRefPtr<SVGUnknownElement> create(const QualifiedName& tagName, Document& document)
     {
         return adoptRef(new SVGUnknownElement(tagName, document));
     }
 
 private:
     SVGUnknownElement(const QualifiedName&, Document&);
 
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
 };
 
 } // namespace WebCore
 
 #endif // SVGUnknownElement_h