Have Node::document() return a reference instead of a pointer

Source/core/svg/SVGTRefElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * 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.
  *
@@ skipping 149 matching lines @@
     // Remove active listeners and clear the text content.
     m_targetListener->detach();
 
     userAgentShadowRoot()->removeChildren();
 
     if (!inDocument())
         return;
 
     // Mark the referenced ID as pending.
     String id;
-    SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), document(), &id);
+    SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), &document(), &id);
     if (!id.isEmpty())
-        document()->accessSVGExtensions()->addPendingResource(id, this);
+        document().accessSVGExtensions()->addPendingResource(id, this);
 }
 
 bool SVGTRefElement::isSupportedAttribute(const QualifiedName& attrName)
 {
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty())
         SVGURIReference::addSupportedAttributes(supportedAttributes);
     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
 }
 
@@ skipping 57 matching lines @@
 void SVGTRefElement::buildPendingResource()
 {
     // Remove any existing event listener.
     m_targetListener->detach();
 
     // If we're not yet in a document, this function will be called again from insertedInto().
     if (!inDocument())
         return;
 
     String id;
-    RefPtr<Element> target = SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), document(), &id);
+    RefPtr<Element> target = SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), &document(), &id);
     if (!target.get()) {
         if (id.isEmpty())
             return;
 
-        document()->accessSVGExtensions()->addPendingResource(id, this);
+        document().accessSVGExtensions()->addPendingResource(id, this);
         ASSERT(hasPendingResources());
         return;
     }
 
     // Don't set up event listeners if this is a shadow tree node.
     // SVGUseElement::transferEventListenersToShadowTree() handles this task, and addEventListener()
     // expects every element instance to have an associated shadow tree element - which is not the
     // case when we land here from SVGUseElement::buildShadowTree().
     if (!isInShadowTree())
         m_targetListener->attach(target);
@@ skipping 10 matching lines @@
 }
 
 void SVGTRefElement::removedFrom(ContainerNode* rootParent)
 {
     SVGElement::removedFrom(rootParent);
     if (rootParent->inDocument())
         m_targetListener->detach();
 }
 
 }