Removed AuthenticationForm.check_for_test_cookie() as per deprecation TL.

django/contrib/auth/forms.py

@@ -200,10 +200,6 @@ class AuthenticationForm(forms.Form):
                 )
         return self.cleaned_data
 
-    def check_for_test_cookie(self):
-        warnings.warn("check_for_test_cookie is deprecated; ensure your login "
-                "view is CSRF-protected.", DeprecationWarning)
-
     def get_user_id(self):
         if self.user_cache:
             return self.user_cache.id