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

Source/core/svg/SVGAnimatedNumberOptionalNumber.h

 /*
  * Copyright (C) 2014 Google Inc. 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 31 matching lines @@
 // while DOM attribute and SMIL animations operate on this class.
 // From Javascript, the two SVGAnimatedNumbers |firstNumber| and |secondNumber| are used.
 // For example, see SVGFEDropShadowElement::stdDeviation{X,Y}()
 class SVGAnimatedNumberOptionalNumber : public SVGAnimatedPropertyCommon<SVGNumberOptionalNumber> {
 public:
     static PassRefPtrWillBeRawPtr<SVGAnimatedNumberOptionalNumber> create(SVGElement* contextElement, const QualifiedName& attributeName, float initialFirstValue = 0, float initialSecondValue = 0)
     {
         return adoptRefWillBeNoop(new SVGAnimatedNumberOptionalNumber(contextElement, attributeName, initialFirstValue, initialSecondValue));
     }
 
-    virtual void setAnimatedValue(PassRefPtrWillBeRawPtr<SVGPropertyBase>) override;
-    virtual bool needsSynchronizeAttribute() override;
-    virtual void animationEnded() override;
+    void setAnimatedValue(PassRefPtrWillBeRawPtr<SVGPropertyBase>) override;
+    bool needsSynchronizeAttribute() override;
+    void animationEnded() override;
 
     SVGAnimatedNumber* firstNumber() { return m_firstNumber.get(); }
     SVGAnimatedNumber* secondNumber() { return m_secondNumber.get(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     SVGAnimatedNumberOptionalNumber(SVGElement* contextElement, const QualifiedName& attributeName, float initialFirstValue, float initialSecondValue);
 
     RefPtrWillBeMember<SVGAnimatedNumber> m_firstNumber;
     RefPtrWillBeMember<SVGAnimatedNumber> m_secondNumber;
 };
 
 } // namespace blink
 
 #endif // SVGAnimatedNumberOptionalNumber_h