Removed Model._meta.get_(add|change|delete)_permission methods per deprecation timeline.

django/db/models/options.py

@@ -455,39 +455,6 @@ class Options(object):
             self._name_map = cache
         return cache
 
-    def get_add_permission(self):
-        """
-        This method has been deprecated in favor of
-        `django.contrib.auth.get_permission_codename`. refs #20642
-        """
-        warnings.warn(
-            "`Options.get_add_permission` has been deprecated in favor "
-            "of `django.contrib.auth.get_permission_codename`.",
-            RemovedInDjango18Warning, stacklevel=2)
-        return 'add_%s' % self.model_name
-
-    def get_change_permission(self):
-        """
-        This method has been deprecated in favor of
-        `django.contrib.auth.get_permission_codename`. refs #20642
-        """
-        warnings.warn(
-            "`Options.get_change_permission` has been deprecated in favor "
-            "of `django.contrib.auth.get_permission_codename`.",
-            RemovedInDjango18Warning, stacklevel=2)
-        return 'change_%s' % self.model_name
-
-    def get_delete_permission(self):
-        """
-        This method has been deprecated in favor of
-        `django.contrib.auth.get_permission_codename`. refs #20642
-        """
-        warnings.warn(
-            "`Options.get_delete_permission` has been deprecated in favor "
-            "of `django.contrib.auth.get_permission_codename`.",
-            RemovedInDjango18Warning, stacklevel=2)
-        return 'delete_%s' % self.model_name
-
     def get_all_related_objects(self, local_only=False, include_hidden=False,
                                 include_proxy_eq=False):
         return [k for k, v in self.get_all_related_objects_with_model(