Revert 157959 "Introduce a new reference graph to SVG*TearOffs."

Source/core/svg/animation/SVGSMILElement.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 533 matching lines @@
         m_cachedRepeatCount = invalidCachedTime;
     else if (attrName == SVGNames::minAttr)
         m_cachedMin = invalidCachedTime;
     else if (attrName == SVGNames::maxAttr)
         m_cachedMax = invalidCachedTime;
     else if (attrName == SVGNames::attributeNameAttr)
         setAttributeName(constructQualifiedName(this, fastGetAttribute(SVGNames::attributeNameAttr)));
     else if (attrName.matches(XLinkNames::hrefAttr)) {
         SVGElementInstance::InvalidationGuard invalidationGuard(this);
         buildPendingResource();
-        if (m_targetElement)
-            clearAnimatedType(m_targetElement);
     } else if (inDocument()) {
         if (attrName == SVGNames::beginAttr)
             beginListChanged(elapsed());
         else if (attrName == SVGNames::endAttr)
             endListChanged(elapsed());
     }
 
     animationAttributeChanged();
 }
 
@@ skipping 720 matching lines @@
     if (eventType == "repeatn") {
         unsigned repeatEventCount = m_repeatEventCountList.first();
         m_repeatEventCountList.remove(0);
         dispatchEvent(RepeatEvent::create(eventType, repeatEventCount));
     } else {
         dispatchEvent(Event::create(eventType));
     }
 }
 
 }