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

Source/core/rendering/RenderTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 702 matching lines @@
     if (l->renderer()->isRenderView()) {
         RenderView* renderView = toRenderView(l->renderer());
         writeRenderNamedFlowThreads(ts, renderView, rootLayer, paintDirtyRect, indent, behavior);
     }
 }
 
 static String nodePosition(Node* node)
 {
     StringBuilder result;
 
-    Element* body = node->document()->body();
+    Element* body = node->document().body();
     Node* parent;
     for (Node* n = node; n; n = parent) {
         parent = n->parentOrShadowHostNode();
         if (n != node)
             result.appendLiteral(" of ");
         if (parent) {
             if (body && n == body) {
                 // We don't care what offset body may be in the document.
                 result.appendLiteral("body");
                 break;
@@ skipping 64 matching lines @@
         printContext.begin(toRenderBox(renderer)->width());
 
     return externalRepresentation(toRenderBox(renderer), behavior);
 }
 
 String externalRepresentation(Element* element, RenderAsTextBehavior behavior)
 {
     // Doesn't support printing mode.
     ASSERT(!(behavior & RenderAsTextPrintingMode));
     if (!(behavior & RenderAsTextDontUpdateLayout))
-        element->document()->updateLayout();
+        element->document().updateLayout();
 
     RenderObject* renderer = element->renderer();
     if (!renderer || !renderer->isBox())
         return String();
 
     return externalRepresentation(toRenderBox(renderer), behavior | RenderAsTextShowAllLayers);
 }
 
 static void writeCounterValuesFromChildren(TextStream& stream, RenderObject* parent, bool& isFirstCounter)
 {
     for (RenderObject* child = parent->firstChild(); child; child = child->nextSibling()) {
         if (child->isCounter()) {
             if (!isFirstCounter)
                 stream << " ";
             isFirstCounter = false;
             String str(toRenderText(child)->text());
             stream << str;
         }
     }
 }
 
 String counterValueForElement(Element* element)
 {
     // Make sure the element is not freed during the layout.
     RefPtr<Element> elementRef(element);
-    element->document()->updateLayout();
+    element->document().updateLayout();
     TextStream stream;
     bool isFirstCounter = true;
     // The counter renderers should be children of :before or :after pseudo-elements.
     if (RenderObject* before = element->pseudoElementRenderer(BEFORE))
         writeCounterValuesFromChildren(stream, before, isFirstCounter);
     if (RenderObject* after = element->pseudoElementRenderer(AFTER))
         writeCounterValuesFromChildren(stream, after, isFirstCounter);
     return stream.release();
 }
 
 String markerTextForListItem(Element* element)
 {
     // Make sure the element is not freed during the layout.
     RefPtr<Element> elementRef(element);
-    element->document()->updateLayout();
+    element->document().updateLayout();
 
     RenderObject* renderer = element->renderer();
     if (!renderer || !renderer->isListItem())
         return String();
 
     return toRenderListItem(renderer)->markerText();
 }
 
 } // namespace WebCore