Allow <use> inside author shadow roots

Source/core/svg/SVGUseElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 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 81 matching lines @@
     void expandUseElementsInShadowTree(Node* element);
     void expandSymbolElementsInShadowTree(Node* element);
 
     // "Tree connector"
     void associateInstancesWithShadowTreeElements(Node* target, SVGElementInstance* targetInstance);
     SVGElementInstance* instanceForShadowTreeElement(Node* element, SVGElementInstance* instance) const;
 
     void transferUseAttributesToReplacedElement(SVGElement* from, SVGElement* to) const;
     void transferEventListenersToShadowTree(SVGElementInstance* target);
 
+    bool isInUserAgentShadowTree() const;
+
     RefPtr<SVGAnimatedLength> m_x;
     RefPtr<SVGAnimatedLength> m_y;
     RefPtr<SVGAnimatedLength> m_width;
     RefPtr<SVGAnimatedLength> m_height;
 
     bool resourceIsStillLoading();
     Document* externalDocument() const;
     bool instanceTreeIsLoading(SVGElementInstance*);
     virtual void notifyFinished(Resource*) OVERRIDE;
     Document* referencedDocument() const;
     void setDocumentResource(ResourcePtr<DocumentResource>);
 
     virtual Timer<SVGElement>* svgLoadEventTimer() OVERRIDE { return &m_svgLoadEventTimer; }
 
     bool m_wasInsertedByParser;
     bool m_haveFiredLoadEvent;
     bool m_needsShadowTreeRecreation;
     RefPtr<SVGElementInstance> m_targetElementInstance;
     ResourcePtr<DocumentResource> m_resource;
     Timer<SVGElement> m_svgLoadEventTimer;
 };
 
 }
 
 #endif