SVG: Move/rename reference management to SVGElement

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 291 matching lines @@
     if (m_targetElementInstance)
         m_targetElementInstance = nullptr;
 
     // FIXME: We should try to optimize this, to at least allow partial reclones.
     if (ShadowRoot* shadowTreeRootElement = userAgentShadowRoot())
         shadowTreeRootElement->removeChildren();
 
     m_needsShadowTreeRecreation = false;
     document().unscheduleUseShadowTreeUpdate(*this);
 
-    document().accessSVGExtensions().removeAllTargetReferencesForElement(this);
+    removeAllOutgoingReferences();
 }
 
 void SVGUseElement::buildPendingResource()
 {
     if (!referencedScope() || inUseShadowTree())
         return;
     clearResourceReferences();
     if (!inDocument())
         return;
 
@@ skipping 147 matching lines @@
 {
     ASSERT(target);
     ASSERT(targetInstance);
 
     // Spec: If the referenced object is itself a 'use', or if there are 'use' subelements within the referenced
     // object, the instance tree will contain recursive expansion of the indirect references to form a complete tree.
     if (isSVGUseElement(*target)) {
         // We only need to track first degree <use> dependencies. Indirect references are handled
         // as the invalidation bubbles up the dependency chain.
         if (!foundUse && !isStructurallyExternal()) {
-            document().accessSVGExtensions().addElementReferencingTarget(this, target);
+            addReferenceTo(target);
             foundUse = true;
         }
     } else if (isDisallowedElement(target)) {
         return false;
     }
 
     targetInstance->setCorrespondingElement(target);
     if (EventTargetData* data = target->eventTargetData())
         data->eventListenerMap.copyEventListenersNotCreatedFromMarkupToTarget(targetInstance);
 
@@ skipping 276 matching lines @@
         m_resource->addClient(this);
 }
 
 void SVGUseElement::trace(Visitor* visitor)
 {
     visitor->trace(m_targetElementInstance);
     SVGGraphicsElement::trace(visitor);
 }
 
 }