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

Source/core/svg/SVGAnimatedAngle.cpp

 /*
  * 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 40 matching lines @@
 {
     AtomicString value;
     if (m_orientType->currentValue()->enumValue() == SVGMarkerOrientAuto)
         value = "auto";
     else
         value = AtomicString(currentValue()->valueAsString());
 
     contextElement()->setSynchronizedLazyAttribute(attributeName(), value);
 }
 
-void SVGAnimatedAngle::animationStarted()
-{
-    SVGAnimatedProperty<SVGAngle>::animationStarted();
-    m_orientType->animationStarted();
-}
-
 void SVGAnimatedAngle::setAnimatedValue(PassRefPtr<SVGPropertyBase> value)
 {
     SVGAnimatedProperty<SVGAngle>::setAnimatedValue(value);
     m_orientType->setAnimatedValue(currentValue()->orientType());
 }
 
 void SVGAnimatedAngle::animationEnded()
 {
     SVGAnimatedProperty<SVGAngle>::animationEnded();
     m_orientType->animationEnded();
 }
 
 }