Don't expose the user agent shadow tree

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 334 matching lines @@
 
 static PassRefPtrWillBeRawPtr<Node> cloneNodeAndAssociate(Node& toClone)
 {
     RefPtrWillBeRawPtr<Node> clone = toClone.cloneNode(false);
     if (!clone->isSVGElement())
         return clone.release();
 
     SVGElement& svgElement = toSVGElement(toClone);
     ASSERT(!svgElement.correspondingElement());
     toSVGElement(clone.get())->setCorrespondingElement(&svgElement);
+    if (EventTargetData* data = toClone.eventTargetData())
+        data->eventListenerMap.copyEventListenersNotCreatedFromMarkupToTarget(clone.get());
     TrackExceptionState exceptionState;
     for (Node* node = toClone.firstChild(); node && !exceptionState.hadException(); node = node->nextSibling())
         clone->appendChild(cloneNodeAndAssociate(*node), exceptionState);
     return clone.release();
 }
 
 void SVGUseElement::buildShadowAndInstanceTree(SVGElement* target)
 {
     ASSERT(!m_targetElementInstance);
 
@@ skipping 111 matching lines @@
         // as the invalidation bubbles up the dependency chain.
         if (!foundUse) {
             document().accessSVGExtensions().addElementReferencingTarget(this, target);
             foundUse = true;
         }
     } else if (isDisallowedElement(target)) {
         return false;
     }
 
     targetInstance->setCorrespondingElement(target);
+    if (EventTargetData* data = target->eventTargetData())
+        data->eventListenerMap.copyEventListenersNotCreatedFromMarkupToTarget(targetInstance);
 
     for (Node* child = target->firstChild(); child; child = child->nextSibling()) {
         // Skip any disallowed element.
         if (isDisallowedElement(child))
             continue;
 
         RefPtrWillBeRawPtr<Node> newChild = child->cloneNode(false);
         targetInstance->appendChild(newChild.get());
         if (newChild->isSVGElement()) {
             // Enter recursion, appending new instance tree nodes to the "instance" object.
@@ skipping 267 matching lines @@
         m_resource->addClient(this);
 }
 
 void SVGUseElement::trace(Visitor* visitor)
 {
     visitor->trace(m_targetElementInstance);
     SVGGraphicsElement::trace(visitor);
 }
 
 }