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

Source/core/svg/SVGStaticStringList.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 36 matching lines @@
 SVGPropertyBase* SVGStaticStringList::currentValueBase()
 {
     return m_value.get();
 }
 
 bool SVGStaticStringList::isAnimating() const
 {
     return false;
 }
 
-void SVGStaticStringList::animationStarted()
-{
-    ASSERT_NOT_REACHED();
-}
-
 PassRefPtr<SVGPropertyBase> SVGStaticStringList::createAnimatedValue()
 {
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 void SVGStaticStringList::setAnimatedValue(PassRefPtr<SVGPropertyBase>)
 {
     ASSERT_NOT_REACHED();
 }
@@ skipping 20 matching lines @@
 {
     TrackExceptionState es;
 
     m_value->setValueAsString(value, es);
 
     if (es.hadException())
         parseError = ParsingAttributeFailedError;
 }
 
 }