Do not implement EventTarget on SVGElementInstance

Source/core/svg/SVGUseElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  * Copyright (C) 2011 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012 University of Szeged
  * Copyright (C) 2012 Renata Hodovan <reni@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 756 matching lines @@
     targetInstance->setShadowTreeElement(element);
     element->setCorrespondingElement(originalElement);
 
     SVGElement* child = Traversal<SVGElement>::firstChild(*target);
     for (SVGElementInstance* instance = targetInstance->firstChild(); child && instance; instance = instance->nextSibling()) {
         associateInstancesWithShadowTreeElements(child, instance);
         child = Traversal<SVGElement>::nextSibling(*child);
     }
 }
 
-SVGElementInstance* SVGUseElement::instanceForShadowTreeElement(Node* element) const
-{
-    if (!m_targetElementInstance) {
-        ASSERT(!inDocument());
-        return 0;
-    }
-
-    return instanceForShadowTreeElement(element, m_targetElementInstance.get());
-}
-
-SVGElementInstance* SVGUseElement::instanceForShadowTreeElement(Node* element, SVGElementInstance* instance) const
-{
-    ASSERT(element);
-    ASSERT(instance);
-
-    // We're dispatching a mutation event during shadow tree construction
-    // this instance hasn't yet been associated to a shadowTree element.
-    if (!instance->shadowTreeElement())
-        return 0;
-
-    if (element == instance->shadowTreeElement())
-        return instance;
-
-    for (SVGElementInstance* current = instance->firstChild(); current; current = current->nextSibling()) {
-        if (SVGElementInstance* search = instanceForShadowTreeElement(element, current))
-            return search;
-    }
-
-    return 0;
-}
-
 void SVGUseElement::invalidateShadowTree()
 {
     if (!inActiveDocument() || m_needsShadowTreeRecreation)
         return;
     scheduleShadowTreeRecreation();
     invalidateDependentShadowTrees();
 }
 
 void SVGUseElement::invalidateDependentShadowTrees()
 {
@@ skipping 92 matching lines @@
         m_resource->addClient(this);
 }
 
 void SVGUseElement::trace(Visitor* visitor)
 {
     visitor->trace(m_targetElementInstance);
     SVGGraphicsElement::trace(visitor);
 }
 
 }