Have EditCommand classes deal with Document references, not pointers

Source/core/editing/InsertParagraphSeparatorCommand.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 InsertParagraphSeparatorCommand_h
 
 #include "core/editing/CompositeEditCommand.h"
 
 namespace WebCore {
 
 class EditingStyle;
 
 class InsertParagraphSeparatorCommand : public CompositeEditCommand {
 public:
-    static PassRefPtr<InsertParagraphSeparatorCommand> create(Document* document, bool useDefaultParagraphElement = false, bool pasteBlockqutoeIntoUnquotedArea = false)
+    static PassRefPtr<InsertParagraphSeparatorCommand> create(Document& document, bool useDefaultParagraphElement = false, bool pasteBlockqutoeIntoUnquotedArea = false)
     {
         return adoptRef(new InsertParagraphSeparatorCommand(document, useDefaultParagraphElement, pasteBlockqutoeIntoUnquotedArea));
     }
 
 private:
-    InsertParagraphSeparatorCommand(Document*, bool useDefaultParagraphElement, bool pasteBlockqutoeIntoUnquotedArea);
+    InsertParagraphSeparatorCommand(Document&, bool useDefaultParagraphElement, bool pasteBlockqutoeIntoUnquotedArea);
 
     virtual void doApply();
 
     void calculateStyleBeforeInsertion(const Position&);
     void applyStyleAfterInsertion(Node* originalEnclosingBlock);
     void getAncestorsInsideBlock(const Node* insertionNode, Element* outerBlock, Vector<RefPtr<Element> >& ancestors);
     PassRefPtr<Element> cloneHierarchyUnderNewBlock(const Vector<RefPtr<Element> >& ancestors, PassRefPtr<Element> blockToInsert);
 
     bool shouldUseDefaultParagraphElement(Node*) const;
 
     virtual bool preservesTypingStyle() const;
 
     RefPtr<EditingStyle> m_style;
 
     bool m_mustUseDefaultParagraphElement;
     bool m_pasteBlockqutoeIntoUnquotedArea;
 };
 
 }
 
 #endif