Have EditCommand classes deal with Document references, not pointers

Source/core/editing/EditCommand.cpp

 /*
  * Copyright (C) 2005, 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 16 matching lines @@
 #include "core/editing/EditCommand.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/editing/CompositeEditCommand.h"
 #include "core/editing/FrameSelection.h"
 #include "core/page/Frame.h"
 
 namespace WebCore {
 
-EditCommand::EditCommand(Document* document)
-    : m_document(document)
+EditCommand::EditCommand(Document& document)
+    : m_document(&document)
     , m_parent(0)
 {
     ASSERT(m_document);
     ASSERT(m_document->frame());
     setStartingSelection(m_document->frame()->selection()->selection());
     setEndingSelection(m_startingSelection);
 }
 
 EditCommand::EditCommand(Document* document, const VisibleSelection& startingSelection, const VisibleSelection& endingSelection)
     : m_document(document)
@@ skipping 63 matching lines @@
 
 #ifndef NDEBUG
 void SimpleEditCommand::addNodeAndDescendants(Node* startNode, HashSet<Node*>& nodes)
 {
     for (Node* node = startNode; node; node = NodeTraversal::next(node, startNode))
         nodes.add(node);
 }
 #endif
 
 } // namespace WebCore