Fix virtual/override/final usage in Source/core/svg/.

Source/core/svg/SVGFESpotLightElement.h

 /*
  * Copyright (C) 2005 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 14 matching lines @@
 namespace blink {
 
 class SVGFESpotLightElement final : public SVGFELightElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     DECLARE_NODE_FACTORY(SVGFESpotLightElement);
 
 private:
     explicit SVGFESpotLightElement(Document&);
 
-    virtual PassRefPtr<LightSource> lightSource(Filter*) const override;
+    PassRefPtr<LightSource> lightSource(Filter*) const override;
 };
 
 } // namespace blink
 
 #endif // SVGFESpotLightElement_h