Have EditCommand classes deal with Document references, not pointers

Source/core/editing/DeleteSelectionCommand.h

 /*
  * Copyright (C) 2005, 2006, 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 @@
 #define DeleteSelectionCommand_h
 
 #include "core/editing/CompositeEditCommand.h"
 
 namespace WebCore {
 
 class EditingStyle;
 
 class DeleteSelectionCommand : public CompositeEditCommand {
 public:
-    static PassRefPtr<DeleteSelectionCommand> create(Document* document, bool smartDelete = false, bool mergeBlocksAfterDelete = true, bool replace = false, bool expandForSpecialElements = false, bool sanitizeMarkup = true)
+    static PassRefPtr<DeleteSelectionCommand> create(Document& document, bool smartDelete = false, bool mergeBlocksAfterDelete = true, bool replace = false, bool expandForSpecialElements = false, bool sanitizeMarkup = true)
     {
         return adoptRef(new DeleteSelectionCommand(document, smartDelete, mergeBlocksAfterDelete, replace, expandForSpecialElements, sanitizeMarkup));
     }
     static PassRefPtr<DeleteSelectionCommand> create(const VisibleSelection& selection, bool smartDelete = false, bool mergeBlocksAfterDelete = true, bool replace = false, bool expandForSpecialElements = false, bool sanitizeMarkup = true)
     {
         return adoptRef(new DeleteSelectionCommand(selection, smartDelete, mergeBlocksAfterDelete, replace, expandForSpecialElements, sanitizeMarkup));
     }
 
 private:
-    DeleteSelectionCommand(Document*, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool santizeMarkup);
+    DeleteSelectionCommand(Document&, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool santizeMarkup);
     DeleteSelectionCommand(const VisibleSelection&, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup);
 
     virtual void doApply();
     virtual EditAction editingAction() const;
 
     virtual bool preservesTypingStyle() const;
 
     void initializeStartEnd(Position&, Position&);
     void setStartingSelectionOnSmartDelete(const Position&, const Position&);
     void initializePositionData();
@@ skipping 38 matching lines @@
     RefPtr<Node> m_startRoot;
     RefPtr<Node> m_endRoot;
     RefPtr<Node> m_startTableRow;
     RefPtr<Node> m_endTableRow;
     RefPtr<Node> m_temporaryPlaceholder;
 };
 
 } // namespace WebCore
 
 #endif // DeleteSelectionCommand_h