Have EditCommand classes deal with Document references, not pointers

Source/core/editing/InsertParagraphSeparatorCommand.h

Index: Source/core/editing/InsertParagraphSeparatorCommand.h
diff --git a/Source/core/editing/InsertParagraphSeparatorCommand.h b/Source/core/editing/InsertParagraphSeparatorCommand.h
index 006c76c5cc3a4759a5ca823275c77382e14c53cd..57f32b3292c745b5ddada9a185f5631a40007c94 100644
--- a/Source/core/editing/InsertParagraphSeparatorCommand.h
+++ b/Source/core/editing/InsertParagraphSeparatorCommand.h
@@ -34,13 +34,13 @@ 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();