SVG: Move/rename reference management to SVGElement

Source/core/svg/SVGPathElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 218 matching lines @@
     }
 
     if (renderer)
         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
 }
 
 void SVGPathElement::invalidateMPathDependencies()
 {
     // <mpath> can only reference <path> but this dependency is not handled in
     // markForLayoutAndParentResourceInvalidation so we update any mpath dependencies manually.
-    if (SVGElementSet* dependencies = document().accessSVGExtensions().setOfElementsReferencingTarget(this)) {
+    if (SVGElementSet* dependencies = setOfIncomingReferences()) {
         SVGElementSet::iterator end = dependencies->end();
         for (SVGElementSet::iterator it = dependencies->begin(); it != end; ++it) {
             if (isSVGMPathElement(**it))
                 toSVGMPathElement(*it)->targetPathChanged();
         }
     }
 }
 
 Node::InsertionNotificationRequest SVGPathElement::insertedInto(ContainerNode* rootParent)
 {
@@ skipping 31 matching lines @@
 
     // FIXME: Eventually we should support getBBox for detached elements.
     if (!renderer())
         return FloatRect();
 
     RenderSVGPath* renderer = toRenderSVGPath(this->renderer());
     return renderer->path().boundingRect();
 }
 
 }