Have EditCommand classes deal with Document references, not pointers

Source/core/editing/FormatBlockCommand.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 22 matching lines @@
 namespace WebCore {
 
 class Document;
 class Element;
 class Position;
 class Range;
 class VisiblePosition;
 
 class FormatBlockCommand : public ApplyBlockElementCommand {
 public:
-    static PassRefPtr<FormatBlockCommand> create(Document* document, const QualifiedName& tagName)
+    static PassRefPtr<FormatBlockCommand> create(Document& document, const QualifiedName& tagName)
     {
         return adoptRef(new FormatBlockCommand(document, tagName));
     }
 
     virtual bool preservesTypingStyle() const { return true; }
 
     static Element* elementForFormatBlockCommand(Range*);
     bool didApply() const { return m_didApply; }
 
 private:
-    FormatBlockCommand(Document*, const QualifiedName& tagName);
+    FormatBlockCommand(Document&, const QualifiedName& tagName);
 
     void formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection);
     void formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtr<Element>&);
     EditAction editingAction() const { return EditActionFormatBlock; }
 
     bool m_didApply;
 };
 
 } // namespace WebCore
 
 #endif // FormatBlockCommand_h