Remove unused animation code after SVG prop migration

Source/core/svg/properties/SVGAnimatedProperty.cpp

 /*
  * Copyright (C) 2013 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 60 matching lines @@
     ASSERT(needsSynchronizeAttribute());
     AtomicString value(currentValueBase()->valueAsString());
     m_contextElement->setSynchronizedLazyAttribute(m_attributeName, value);
 }
 
 bool SVGAnimatedPropertyBase::isSpecified() const
 {
     return isAnimating() || contextElement()->hasAttribute(attributeName());
 }
 
-void SVGAnimatedPropertyBase::commitChange()
-{
-    contextElement()->invalidateSVGAttributes();
-    contextElement()->svgAttributeChanged(m_attributeName);
-}
-
 } // namespace WebCore