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

Source/core/rendering/svg/RenderSVGModelObject.cpp

 /*
  * Copyright (c) 2009, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 112 matching lines @@
 
 bool RenderSVGModelObject::nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction)
 {
     ASSERT_NOT_REACHED();
     return false;
 }
 
 static void getElementCTM(SVGElement* element, AffineTransform& transform)
 {
     ASSERT(element);
-    element->document()->updateLayoutIgnorePendingStylesheets();
+    element->document().updateLayoutIgnorePendingStylesheets();
 
     SVGElement* stopAtElement = SVGLocatable::nearestViewportElement(element);
     ASSERT(stopAtElement);
 
     AffineTransform localTransform;
     Node* current = element;
 
     while (current && current->isSVGElement()) {
         SVGElement* currentElement = toSVGElement(current);
         localTransform = currentElement->renderer()->localToParentTransform();
@@ skipping 55 matching lines @@
     if (!isGraphicsElement(renderer))
         return false;
     AffineTransform ctm;
     SVGElement* svgElement = toSVGElement(renderer->node());
     getElementCTM(svgElement, ctm);
     ASSERT(svgElement->renderer());
     return rect.contains(ctm.mapRect(svgElement->renderer()->repaintRectInLocalCoordinates()));
 }
 
 } // namespace WebCore