Fix SVGUseElement "instance tree loading" status check

third_party/WebKit/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 779 matching lines @@
         if (!isStructurallyExternal())
             return;
         ASSERT(!m_haveFiredLoadEvent);
         m_haveFiredLoadEvent = true;
         svgUseLoadEventSender().dispatchEventSoon(this);
     }
 }
 
 bool SVGUseElement::resourceIsStillLoading() const
 {
-    if (m_resource && m_resource->isLoading())
-        return true;
-    return false;
+    return m_resource && m_resource->isLoading();
 }
 
 bool SVGUseElement::instanceTreeIsLoading(const SVGElement* targetInstance)
 {
-    for (const SVGElement* element = Traversal<SVGElement>::firstChild(*targetInstance); element; element = Traversal<SVGElement>::nextSibling(*element)) {
-        if (const SVGUseElement* use = element->correspondingUseElement()) {
-            if (use->resourceIsStillLoading())
-                return true;
-        }
-        if (element->hasChildren() && instanceTreeIsLoading(element))
+    for (const SVGElement* element = targetInstance; element; element = Traversal<SVGElement>::next(*element, targetInstance)) {
+        if (isSVGUseElement(*element) && toSVGUseElement(*element).resourceIsStillLoading())
             return true;
     }
     return false;
 }
 
 void SVGUseElement::setDocumentResource(ResourcePtr<DocumentResource> resource)
 {
     if (m_resource == resource)
         return;
 
     if (m_resource)
         m_resource->removeClient(this);
 
     m_resource = resource;
     if (m_resource)
         m_resource->addClient(this);
 }
 
 }