This method was present in 3.11 alpha (al least update #8530), but is not present in update #9854 (and in 4.1), is called when you want to see the textual representation on a etoys script.

If I copy the method works ok, but I don't know if is some reason for the delete, by the way the other class method of MethodHolder makeIsolatedCodePaneForClass:selector: is also removed.