Removed extras/csrf_migration_helper.py

Author: timgraham

docs/ref/contrib/csrf.txt

@@ -72,10 +72,6 @@ To enable CSRF protection for your views, follow these steps:
       :func:`~django.shortcuts.render_to_response()` wrapper that takes care
       of this step for you.
 
-The utility script ``extras/csrf_migration_helper.py`` (located in the Django
-distribution, but not installed) can help to automate the finding of code and
-templates that may need these steps. It contains full help on how to use it.
-
 .. _csrf-ajax:
 
 AJAX