Have EditCommand classes deal with Document references, not pointers

Source/core/editing/InsertTextCommand.h

Index: Source/core/editing/InsertTextCommand.h
diff --git a/Source/core/editing/InsertTextCommand.h b/Source/core/editing/InsertTextCommand.h
index 3663bc46a5b2f9ddb0c32ee718a843473a71bc64..10c8d80ea49d290e314ac52e928361afa59edba2 100644
--- a/Source/core/editing/InsertTextCommand.h
+++ b/Source/core/editing/InsertTextCommand.h
@@ -48,21 +48,21 @@ public:
         RebalanceAllWhitespaces
     };
 
-    static PassRefPtr<InsertTextCommand> create(Document* document, const String& text, bool selectInsertedText = false,
+    static PassRefPtr<InsertTextCommand> create(Document& document, const String& text, bool selectInsertedText = false,
         RebalanceType rebalanceType = RebalanceLeadingAndTrailingWhitespaces)
     {
         return adoptRef(new InsertTextCommand(document, text, selectInsertedText, rebalanceType));
     }
 
-    static PassRefPtr<InsertTextCommand> createWithMarkerSupplier(Document* document, const String& text, PassRefPtr<TextInsertionMarkerSupplier> markerSupplier)
+    static PassRefPtr<InsertTextCommand> createWithMarkerSupplier(Document& document, const String& text, PassRefPtr<TextInsertionMarkerSupplier> markerSupplier)
     {
         return adoptRef(new InsertTextCommand(document, text, markerSupplier));
     }
 
 private:
 
-    InsertTextCommand(Document*, const String& text, bool selectInsertedText, RebalanceType);
-    InsertTextCommand(Document*, const String& text, PassRefPtr<TextInsertionMarkerSupplier>);
+    InsertTextCommand(Document&, const String& text, bool selectInsertedText, RebalanceType);
+    InsertTextCommand(Document&, const String& text, PassRefPtr<TextInsertionMarkerSupplier>);
 
     void deleteCharacter();