Removed db.backends methods which only call super().

django/db/backends/mysql/base.py

@@ -184,9 +184,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     atomic_transactions = False
     supports_column_check_constraints = False
 
-    def __init__(self, connection):
-        super(DatabaseFeatures, self).__init__(connection)
-
     @cached_property
     def _mysql_storage_engine(self):
         "Internal method used in Django tests. Don't rely on this from your code"

django/db/backends/oracle/creation.py

@@ -56,9 +56,6 @@ class DatabaseCreation(BaseDatabaseCreation):
         'PositiveSmallIntegerField': '%(qn_column)s >= 0',
     }
 
-    def __init__(self, connection):
-        super(DatabaseCreation, self).__init__(connection)
-
     def _create_test_db(self, verbosity=1, autoclobber=False, keepdb=False):
         parameters = self._get_test_db_params()
         cursor = self.connection.cursor()

django/db/backends/postgresql_psycopg2/operations.py

@@ -5,8 +5,6 @@ from django.db.backends import BaseDatabaseOperations
 
 
 class DatabaseOperations(BaseDatabaseOperations):
-    def __init__(self, connection):
-        super(DatabaseOperations, self).__init__(connection)
 
     def date_extract_sql(self, lookup_type, field_name):
         # http://www.postgresql.org/docs/current/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT