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

Source/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 Apple 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 389 matching lines @@
 
     virtual void updateLogicalWidth();
     virtual void updateLogicalHeight();
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const;
 
     RenderBoxRegionInfo* renderBoxRegionInfo(RenderRegion*, LayoutUnit offsetFromLogicalTopOfFirstPage, RenderBoxRegionInfoFlags = CacheRenderBoxRegionInfo) const;
     void computeLogicalWidthInRegion(LogicalExtentComputedValues&, RenderRegion* = 0, LayoutUnit offsetFromLogicalTopOfFirstPage = 0) const;
 
     bool stretchesToViewport() const
     {
-        return document()->inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isRoot() || isBody()) && !document()->shouldDisplaySeamlesslyWithParent() && !isInline();
+        return document().inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isRoot() || isBody()) && !document().shouldDisplaySeamlesslyWithParent() && !isInline();
     }
 
     virtual LayoutSize intrinsicSize() const { return LayoutSize(); }
     LayoutUnit intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
     LayoutUnit intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
 
     // Whether or not the element shrinks to its intrinsic width (rather than filling the width
     // of a containing block).  HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
     bool sizesLogicalWidthToFitContent(SizeType) const;
 
@@ skipping 337 matching lines @@
         if (UNLIKELY(m_inlineBoxWrapper != 0))
             deleteLineBoxWrapper();
     }
 
     m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace WebCore
 
 #endif // RenderBox_h