Have EditCommand classes deal with Document references, not pointers

Source/core/editing/CreateLinkCommand.h

 /*
  * Copyright (C) 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 14 matching lines @@
 
 #ifndef CreateLinkCommand_h
 #define CreateLinkCommand_h
 
 #include "core/editing/CompositeEditCommand.h"
 
 namespace WebCore {
 
 class CreateLinkCommand : public CompositeEditCommand {
 public:
-    static PassRefPtr<CreateLinkCommand> create(Document* document, const String& linkURL)
+    static PassRefPtr<CreateLinkCommand> create(Document& document, const String& linkURL)
     {
         return adoptRef(new CreateLinkCommand(document, linkURL));
     }
 
     bool isCreateLinkCommand() const { return true; }
 
 private:
-    CreateLinkCommand(Document*, const String& linkURL);
+    CreateLinkCommand(Document&, const String& linkURL);
 
     virtual void doApply();
     virtual EditAction editingAction() const { return EditActionCreateLink; }
 
     String m_url;
 };
 
 } // namespace WebCore
 
 #endif // CreateLinkCommand_h