Have EditCommand classes deal with Document references, not pointers

Source/core/editing/InsertListCommand.h

Index: Source/core/editing/InsertListCommand.h
diff --git a/Source/core/editing/InsertListCommand.h b/Source/core/editing/InsertListCommand.h
index 13526e1f4651cce8449e07ba26ff0e3fc2ee5cdd..80933b253d2f1f57ac7487dfecdc3d13bd112c1e 100644
--- a/Source/core/editing/InsertListCommand.h
+++ b/Source/core/editing/InsertListCommand.h
@@ -36,17 +36,17 @@ class InsertListCommand : public CompositeEditCommand {
 public:
     enum Type { OrderedList, UnorderedList };
 
-    static PassRefPtr<InsertListCommand> create(Document* document, Type listType)
+    static PassRefPtr<InsertListCommand> create(Document& document, Type listType)
     {
         return adoptRef(new InsertListCommand(document, listType));
     }
 
-    static PassRefPtr<HTMLElement> insertList(Document*, Type);
+    static PassRefPtr<HTMLElement> insertList(Document&, Type);
 
     virtual bool preservesTypingStyle() const { return true; }
 
 private:
-    InsertListCommand(Document*, Type);
+    InsertListCommand(Document&, Type);
 
     virtual void doApply();
     virtual EditAction editingAction() const { return EditActionInsertList; }