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

Source/core/rendering/RootInlineBox.cpp

 /*
  * Copyright (C) 2003, 2006, 2008 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 232 matching lines @@
         return 0;
 
     LayoutUnit maxPositionTop = 0;
     LayoutUnit maxPositionBottom = 0;
     int maxAscent = 0;
     int maxDescent = 0;
     bool setMaxAscent = false;
     bool setMaxDescent = false;
 
     // Figure out if we're in no-quirks mode.
-    bool noQuirksMode = renderer()->document()->inNoQuirksMode();
+    bool noQuirksMode = renderer()->document().inNoQuirksMode();
 
     m_baselineType = requiresIdeographicBaseline(textBoxDataMap) ? IdeographicBaseline : AlphabeticBaseline;
 
     computeLogicalBoxHeights(this, maxPositionTop, maxPositionBottom, maxAscent, maxDescent, setMaxAscent, setMaxDescent, noQuirksMode,
                              textBoxDataMap, baselineType(), verticalPositionCache);
 
     if (maxAscent + maxDescent < max(maxPositionTop, maxPositionBottom))
         adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
 
     LayoutUnit maxHeight = maxAscent + maxDescent;
@@ skipping 571 matching lines @@
     if (box->renderer()->isText())
         return box->parent()->logicalTop();
 
     RenderBoxModelObject* renderer = box->boxModelObject();
     ASSERT(renderer->isInline());
     if (!renderer->isInline())
         return 0;
 
     // This method determines the vertical position for inline elements.
     bool firstLine = isFirstLineStyle();
-    if (firstLine && !renderer->document()->styleSheetCollections()->usesFirstLineRules())
+    if (firstLine && !renderer->document().styleSheetCollections()->usesFirstLineRules())
         firstLine = false;
 
     // Check the cache.
     bool isRenderInline = renderer->isRenderInline();
     if (isRenderInline && !firstLine) {
         LayoutUnit verticalPosition = verticalPositionCache.get(renderer, baselineType());
         if (verticalPosition != PositionUndefined)
             return verticalPosition;
     }
 
@@ skipping 133 matching lines @@
 }
 
 #ifndef NDEBUG
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 #endif
 
 } // namespace WebCore