Have EditCommand classes deal with Document references, not pointers

Source/core/editing/SimplifyMarkupCommand.cpp

 /*
  * Copyright (C) 2012 Apple Computer, 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/SimplifyMarkupCommand.h"
 
 #include "core/dom/NodeRenderStyle.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/rendering/RenderInline.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/style/RenderStyle.h"
 
 namespace WebCore {
 
-SimplifyMarkupCommand::SimplifyMarkupCommand(Document* document, Node* firstNode, Node* nodeAfterLast)
+SimplifyMarkupCommand::SimplifyMarkupCommand(Document& document, Node* firstNode, Node* nodeAfterLast)
     : CompositeEditCommand(document), m_firstNode(firstNode), m_nodeAfterLast(nodeAfterLast)
 {
 }
 
 void SimplifyMarkupCommand::doApply()
 {
     Node* rootNode = m_firstNode->parentNode();
     Vector<RefPtr<Node> > nodesToRemove;
 
     // Walk through the inserted nodes, to see if there are elements that could be removed
@@ skipping 68 matching lines @@
         return 0;
 
     removeNode(nodesToRemove[startNodeIndex], AssumeContentIsAlwaysEditable);
     insertNodeBefore(nodesToRemove[startNodeIndex], highestAncestorToRemove, AssumeContentIsAlwaysEditable);
     removeNode(highestAncestorToRemove, AssumeContentIsAlwaysEditable);
 
     return pastLastNodeToRemove - startNodeIndex - 1;
 }
 
 } // namespace WebCore