Don't add redundant references to animated target element

third_party/WebKit/Source/core/svg/SVGAnimateElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 164 matching lines @@
     SVGElement* targetElement = this->targetElement();
     const QualifiedName& attributeName = this->attributeName();
 
     m_animator.reset(targetElement);
 
     ShouldApplyAnimationType shouldApply = shouldApplyAnimation(targetElement, attributeName);
     if (shouldApply == DontApplyAnimation)
         return;
     if (shouldApply == ApplyXMLAnimation || shouldApply == ApplyXMLandCSSAnimation) {
         // SVG DOM animVal animation code-path.
-        SVGElementInstances animatedElements = findElementInstances(targetElement);
-        ASSERT(!animatedElements.isEmpty());
-
-        for (SVGElement* element : animatedElements)
-            addReferenceTo(element);
-
         m_animatedProperty = m_animator.createAnimatedValue();
         targetElement->setAnimatedAttribute(attributeName, m_animatedProperty);
         return;
     }
     DCHECK_EQ(shouldApply, ApplyCSSAnimation);
 
     // CSS properties animation code-path.
     String baseValue;
     DCHECK(isTargetAttributeCSSProperty(targetElement, attributeName));
     computeCSSPropertyValue(targetElement, cssPropertyID(attributeName.localName()), baseValue);
@@ skipping 126 matching lines @@
 {
     visitor->trace(m_fromProperty);
     visitor->trace(m_toProperty);
     visitor->trace(m_toAtEndOfDurationProperty);
     visitor->trace(m_animatedProperty);
     visitor->trace(m_animator);
     SVGAnimationElement::trace(visitor);
 }
 
 } // namespace blink