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

Source/core/dom/Text.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 55 matching lines @@
     setDataWithoutUpdate(oldStr.substring(0, offset));
 
     didModifyData(oldStr);
 
     if (parentNode())
         parentNode()->insertBefore(newText.get(), nextSibling(), es);
     if (es.hadException())
         return 0;
 
     if (parentNode())
-        document()->textNodeSplit(this);
+        document().textNodeSplit(this);
 
     if (renderer())
         toRenderText(renderer())->setTextWithOffset(dataImpl(), 0, oldStr.length());
 
     return newText.release();
 }
 
 static const Text* earliestLogicallyAdjacentTextNode(const Text* t)
 {
     const Node* n = t;
@@ skipping 177 matching lines @@
 void Text::attach(const AttachContext& context)
 {
     NodeRenderingContext(this, context.resolvedStyle).createRendererForTextIfNeeded();
     CharacterData::attach(context);
 }
 
 bool Text::recalcTextStyle(StyleChange change)
 {
     if (RenderText* renderer = toRenderText(this->renderer())) {
         if (change != NoChange || needsStyleRecalc())
-            renderer->setStyle(document()->styleResolver()->styleForText(this));
+            renderer->setStyle(document().styleResolver()->styleForText(this));
         if (needsStyleRecalc())
             renderer->setText(dataImpl());
         clearNeedsStyleRecalc();
     } else if (needsStyleRecalc() || needsWhitespaceRenderer()) {
         reattach();
         return true;
     }
     return false;
 }
 
@@ skipping 22 matching lines @@
     textRenderer->setTextWithOffset(dataImpl(), offsetOfReplacedData, lengthOfReplacedData);
 }
 
 bool Text::childTypeAllowed(NodeType) const
 {
     return false;
 }
 
 PassRefPtr<Text> Text::cloneWithData(const String& data)
 {
-    return create(document(), data);
+    return create(&document(), data);
 }
 
 PassRefPtr<Text> Text::createWithLengthLimit(Document* document, const String& data, unsigned start, unsigned lengthLimit)
 {
     unsigned dataLength = data.length();
 
     if (!start && dataLength <= lengthLimit)
         return create(document, data);
 
     RefPtr<Text> result = Text::create(document, String());
@@ skipping 16 matching lines @@
             result.appendLiteral("; ");
         result.appendLiteral("value=");
         result.append(s);
     }
 
     strncpy(buffer, result.toString().utf8().data(), length - 1);
 }
 #endif
 
 } // namespace WebCore