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

Source/core/rendering/svg/RenderSVGTextPath.cpp

 /*
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 18 matching lines @@
 namespace WebCore {
 
 RenderSVGTextPath::RenderSVGTextPath(Element* element)
     : RenderSVGInline(element)
 {
 }
 
 Path RenderSVGTextPath::layoutPath() const
 {
     SVGTextPathElement* textPathElement = toSVGTextPathElement(node());
-    Element* targetElement = SVGURIReference::targetElementFromIRIString(textPathElement->hrefCurrentValue(), textPathElement->document());
+    Element* targetElement = SVGURIReference::targetElementFromIRIString(textPathElement->hrefCurrentValue(), &textPathElement->document());
     if (!targetElement || !targetElement->hasTagName(SVGNames::pathTag))
         return Path();
 
     SVGPathElement* pathElement = toSVGPathElement(targetElement);
 
     Path pathData;
     updatePathFromGraphicsElement(pathElement, pathData);
 
     // Spec:  The transform attribute on the referenced 'path' element represents a
     // supplemental transformation relative to the current user coordinate system for
@@ skipping 13 matching lines @@
 {
     return toSVGTextPathElement(node())->spacingCurrentValue() == SVGTextPathSpacingExact;
 }
 
 bool RenderSVGTextPath::stretchMethod() const
 {
     return toSVGTextPathElement(node())->methodCurrentValue() == SVGTextPathMethodStretch;
 }
 
 }