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

Source/core/editing/SplitTextNodeContainingElementCommand.cpp

 /*
  * Copyright (C) 2005, 2008 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 16 matching lines @@
 #include "core/editing/SplitTextNodeContainingElementCommand.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/Text.h"
 #include "core/rendering/RenderObject.h"
 #include "wtf/Assertions.h"
 
 namespace WebCore {
 
 SplitTextNodeContainingElementCommand::SplitTextNodeContainingElementCommand(PassRefPtr<Text> text, int offset)
-    : CompositeEditCommand(text->document()), m_text(text), m_offset(offset)
+    : CompositeEditCommand(&text->document()), m_text(text), m_offset(offset)
 {
     ASSERT(m_text);
     ASSERT(m_text->length() > 0);
 }
 
 void SplitTextNodeContainingElementCommand::doApply()
 {
     ASSERT(m_text);
     ASSERT(m_offset > 0);
 
     splitTextNode(m_text.get(), m_offset);
 
     Element* parent = m_text->parentElement();
     if (!parent || !parent->parentElement() || !parent->parentElement()->rendererIsEditable())
         return;
 
     RenderObject* parentRenderer = parent->renderer();
     if (!parentRenderer || !parentRenderer->isInline()) {
         wrapContentsInDummySpan(parent);
         Node* firstChild = parent->firstChild();
         if (!firstChild || !firstChild->isElementNode())
             return;
         parent = toElement(firstChild);
     }
 
     splitElement(parent, m_text);
 }
 
 }