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

Source/core/rendering/svg/RenderSVGRoot.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * 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
@@ skipping 101 matching lines @@
 bool RenderSVGRoot::isEmbeddedThroughSVGImage() const
 {
     return SVGImage::isInSVGImage(toSVGSVGElement(node()));
 }
 
 bool RenderSVGRoot::isEmbeddedThroughFrameContainingSVGDocument() const
 {
     if (!node())
         return false;
 
-    Frame* frame = node()->document()->frame();
+    Frame* frame = node()->document().frame();
     if (!frame)
         return false;
 
     // If our frame has an owner renderer, we're embedded through eg. object/embed/iframe,
     // but we only negotiate if we're in an SVG document.
     if (!frame->ownerRenderer())
         return false;
     return frame->document()->isSVGDocument();
 }
 
@@ skipping 12 matching lines @@
         return m_containerSize.width();
 
     if (style()->logicalWidth().isSpecified() || style()->logicalMaxWidth().isSpecified())
         return RenderReplaced::computeReplacedLogicalWidth(shouldComputePreferred);
 
     if (svg->widthAttributeEstablishesViewport())
         return resolveLengthAttributeForSVG(svg->intrinsicWidth(SVGSVGElement::IgnoreCSSProperties), style()->effectiveZoom(), containingBlock()->availableLogicalWidth(), view());
 
     // SVG embedded through object/embed/iframe.
     if (isEmbeddedThroughFrameContainingSVGDocument())
-        return document()->frame()->ownerRenderer()->availableLogicalWidth();
+        return document().frame()->ownerRenderer()->availableLogicalWidth();
 
     // SVG embedded via SVGImage (background-image/border-image/etc) / Inline SVG.
     return RenderReplaced::computeReplacedLogicalWidth(shouldComputePreferred);
 }
 
 LayoutUnit RenderSVGRoot::computeReplacedLogicalHeight() const
 {
     SVGSVGElement* svg = toSVGSVGElement(node());
     ASSERT(svg);
 
@@ skipping 14 matching lines @@
                 cb->addPercentHeightDescendant(const_cast<RenderSVGRoot*>(this));
             }
         } else
             RenderBlock::removePercentHeightDescendant(const_cast<RenderSVGRoot*>(this));
 
         return resolveLengthAttributeForSVG(height, style()->effectiveZoom(), containingBlock()->availableLogicalHeight(IncludeMarginBorderPadding), view());
     }
 
     // SVG embedded through object/embed/iframe.
     if (isEmbeddedThroughFrameContainingSVGDocument())
-        return document()->frame()->ownerRenderer()->availableLogicalHeight(IncludeMarginBorderPadding);
+        return document().frame()->ownerRenderer()->availableLogicalHeight(IncludeMarginBorderPadding);
 
     // SVG embedded via SVGImage (background-image/border-image/etc) / Inline SVG.
     return RenderReplaced::computeReplacedLogicalHeight();
 }
 
 void RenderSVGRoot::layout()
 {
     ASSERT(needsLayout());
 
     m_resourcesNeedingToInvalidateClients.clear();
@@ skipping 278 matching lines @@
 {
     RenderObject* svgRoot = resource->parent();
     while (svgRoot && !svgRoot->isSVGRoot())
         svgRoot = svgRoot->parent();
     if (!svgRoot)
         return;
     toRenderSVGRoot(svgRoot)->m_resourcesNeedingToInvalidateClients.add(resource);
 }
 
 }