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

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. 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 204 matching lines @@
         int width = getAttribute(widthAttr).toInt(&ok);
         if (ok)
             return width;
 
         // if the image is available, use its width
         if (m_imageLoader.image())
             return m_imageLoader.image()->imageSizeForRenderer(renderer(), 1.0f).width();
     }
 
     if (ignorePendingStylesheets)
-        document()->updateLayoutIgnorePendingStylesheets();
+        document().updateLayoutIgnorePendingStylesheets();
     else
-        document()->updateLayout();
+        document().updateLayout();
 
     RenderBox* box = renderBox();
     return box ? adjustForAbsoluteZoom(box->contentBoxRect().pixelSnappedWidth(), box) : 0;
 }
 
 int HTMLImageElement::height(bool ignorePendingStylesheets)
 {
     if (!renderer()) {
         // check the attribute first for an explicit pixel value
         bool ok;
         int height = getAttribute(heightAttr).toInt(&ok);
         if (ok)
             return height;
 
         // if the image is available, use its height
         if (m_imageLoader.image())
             return m_imageLoader.image()->imageSizeForRenderer(renderer(), 1.0f).height();
     }
 
     if (ignorePendingStylesheets)
-        document()->updateLayoutIgnorePendingStylesheets();
+        document().updateLayoutIgnorePendingStylesheets();
     else
-        document()->updateLayout();
+        document().updateLayout();
 
     RenderBox* box = renderBox();
     return box ? adjustForAbsoluteZoom(box->contentBoxRect().pixelSnappedHeight(), box) : 0;
 }
 
 int HTMLImageElement::naturalWidth() const
 {
     if (!m_imageLoader.image())
         return 0;
 
@@ skipping 28 matching lines @@
     return !equalIgnoringCase(getAttribute(draggableAttr), "false");
 }
 
 void HTMLImageElement::setHeight(int value)
 {
     setAttribute(heightAttr, String::number(value));
 }
 
 KURL HTMLImageElement::src() const
 {
-    return document()->completeURL(getAttribute(srcAttr));
+    return document().completeURL(getAttribute(srcAttr));
 }
 
 void HTMLImageElement::setSrc(const String& value)
 {
     setAttribute(srcAttr, value);
 }
 
 void HTMLImageElement::setWidth(int value)
 {
     setAttribute(widthAttr, String::number(value));
@@ skipping 25 matching lines @@
 {
     return m_imageLoader.imageComplete();
 }
 
 void HTMLImageElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
 {
     HTMLElement::addSubresourceAttributeURLs(urls);
 
     addSubresourceURL(urls, src());
     // FIXME: What about when the usemap attribute begins with "#"?
-    addSubresourceURL(urls, document()->completeURL(getAttribute(usemapAttr)));
+    addSubresourceURL(urls, document().completeURL(getAttribute(usemapAttr)));
 }
 
 void HTMLImageElement::didMoveToNewDocument(Document* oldDocument)
 {
     m_imageLoader.elementDidMoveToNewDocument();
     HTMLElement::didMoveToNewDocument(oldDocument);
 }
 
 bool HTMLImageElement::isServerMap() const
 {
     if (!fastHasAttribute(ismapAttr))
         return false;
 
     const AtomicString& usemap = fastGetAttribute(usemapAttr);
 
     // If the usemap attribute starts with '#', it refers to a map element in the document.
     if (usemap.string()[0] == '#')
         return false;
 
-    return document()->completeURL(stripLeadingAndTrailingHTMLSpaces(usemap)).isEmpty();
+    return document().completeURL(stripLeadingAndTrailingHTMLSpaces(usemap)).isEmpty();
 }
 
 Image* HTMLImageElement::imageContents()
 {
     if (!m_imageLoader.imageComplete())
         return 0;
 
     return m_imageLoader.image()->image();
 }
 
 }