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

Source/core/editing/InsertNodeBeforeCommand.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 15 matching lines @@
 #include "config.h"
 #include "core/editing/InsertNodeBeforeCommand.h"
 
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Document.h"
 
 namespace WebCore {
 
 InsertNodeBeforeCommand::InsertNodeBeforeCommand(PassRefPtr<Node> insertChild, PassRefPtr<Node> refChild,
     ShouldAssumeContentIsAlwaysEditable shouldAssumeContentIsAlwaysEditable)
-    : SimpleEditCommand(refChild->document())
+    : SimpleEditCommand(&refChild->document())
     , m_insertChild(insertChild)
     , m_refChild(refChild)
     , m_shouldAssumeContentIsAlwaysEditable(shouldAssumeContentIsAlwaysEditable)
 {
     ASSERT(m_insertChild);
     ASSERT(!m_insertChild->parentNode());
     ASSERT(m_refChild);
     ASSERT(m_refChild->parentNode());
 
     ASSERT(m_refChild->parentNode()->rendererIsEditable() || !m_refChild->parentNode()->attached());
@@ skipping 19 matching lines @@
 
 #ifndef NDEBUG
 void InsertNodeBeforeCommand::getNodesInCommand(HashSet<Node*>& nodes)
 {
     addNodeAndDescendants(m_insertChild.get(), nodes);
     addNodeAndDescendants(m_refChild.get(), nodes);
 }
 #endif
 
 }