Removed BaseDatabaseCreation.set_autocommit per deprecation timeline.

django/db/backends/creation.py

@@ -5,7 +5,6 @@ import warnings
 
 from django.conf import settings
 from django.db.utils import load_backend
-from django.utils.deprecation import RemovedInDjango18Warning
 from django.utils.encoding import force_bytes
 from django.utils.functional import cached_property
 from django.utils.six.moves import input
@@ -467,17 +466,6 @@ class BaseDatabaseCreation(object):
             cursor.execute("DROP DATABASE %s"
                            % self.connection.ops.quote_name(test_database_name))
 
-    def set_autocommit(self):
-        """
-        Make sure a connection is in autocommit mode. - Deprecated, not used
-        anymore by Django code. Kept for compatibility with user code that
-        might use it.
-        """
-        warnings.warn(
-            "set_autocommit was moved from BaseDatabaseCreation to "
-            "BaseDatabaseWrapper.", RemovedInDjango18Warning, stacklevel=2)
-        return self.connection.set_autocommit(True)
-
     def sql_table_creation_suffix(self):
         """
         SQL to append to the end of the test table creation statements.