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

Source/core/svg/SVGDiscardElement.h

 /*
  * Copyright (C) 2014 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 22 matching lines @@
 
 #include "core/svg/animation/SVGSMILElement.h"
 
 namespace blink {
 
 class SVGDiscardElement final : public SVGSMILElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     DECLARE_NODE_FACTORY(SVGDiscardElement);
 
-    virtual bool isSVGDiscardElement() const override { return true; }
+    bool isSVGDiscardElement() const override { return true; }
 private:
     explicit SVGDiscardElement(Document&);
 
-    virtual void resetAnimatedType() override { }
-    virtual void clearAnimatedType() override { }
-    virtual void applyResultsToTarget() override { }
-    virtual bool hasValidAttributeType() override;
-    virtual bool hasValidAttributeName() override;
-    virtual void animationAttributeChanged() override { }
+    void resetAnimatedType() override { }
+    void clearAnimatedType() override { }
+    void applyResultsToTarget() override { }
+    bool hasValidAttributeType() override;
+    bool hasValidAttributeName() override;
+    void animationAttributeChanged() override { }
 
-    virtual void startedActiveInterval() override { }
-    virtual void updateAnimation(float percent, unsigned repeat, SVGSMILElement* resultElement) override { }
+    void startedActiveInterval() override { }
+    void updateAnimation(float percent, unsigned repeat, SVGSMILElement* resultElement) override { }
 };
 
 } // namespace blink
 
 #endif // SVGDiscardElement_h