SVG: Remove SVGAnimatedPropertyBase::startAnimation and its overrides which are already all NOOP

Source/core/svg/SVGAnimatedAngle.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 35 matching lines @@
     }
 
     virtual ~SVGAnimatedAngle();
 
     SVGAnimatedEnumeration<SVGMarkerOrientType>* orientType() { return m_orientType.get(); }
 
     // SVGAnimatedPropertyBase:
 
     virtual void synchronizeAttribute() OVERRIDE;
 
-    virtual void animationStarted() OVERRIDE;
     virtual void setAnimatedValue(PassRefPtr<SVGPropertyBase>) OVERRIDE;
     virtual void animationEnded() OVERRIDE;
 
 protected:
     SVGAnimatedAngle(SVGMarkerElement* contextElement);
 
 private:
     RefPtr<SVGAnimatedEnumeration<SVGMarkerOrientType> > m_orientType;
 };
 
 } // namespace WebCore
 
 #endif // SVGAnimatedAngle_h