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

Source/core/svg/SVGAnimateMotionElement.cpp

Index: Source/core/svg/SVGAnimateMotionElement.cpp
diff --git a/Source/core/svg/SVGAnimateMotionElement.cpp b/Source/core/svg/SVGAnimateMotionElement.cpp
index c5f2de87ce855f7e0c11252b8c97ddc245dc1dc0..faf70569fda14ab512424b625b4aeb492b8f67e5 100644
--- a/Source/core/svg/SVGAnimateMotionElement.cpp
+++ b/Source/core/svg/SVGAnimateMotionElement.cpp
@@ -49,12 +49,6 @@ inline SVGAnimateMotionElement::SVGAnimateMotionElement(const QualifiedName& tag
     ScriptWrappable::init(this);
 }
 
-SVGAnimateMotionElement::~SVGAnimateMotionElement()
-{
-    if (targetElement())
-        clearAnimatedType(targetElement());
-}
-
 PassRefPtr<SVGAnimateMotionElement> SVGAnimateMotionElement::create(const QualifiedName& tagName, Document& document)
 {
     return adoptRef(new SVGAnimateMotionElement(tagName, document));