Removed legacy transaction management per the deprecation timeline.

django/db/__init__.py

@@ -77,20 +77,6 @@ class DefaultBackendProxy(object):
 backend = DefaultBackendProxy()
 
 
-def close_connection(**kwargs):
-    warnings.warn(
-        "close_connection is superseded by close_old_connections.",
-        RemovedInDjango18Warning, stacklevel=2)
-    # Avoid circular imports
-    from django.db import transaction
-    for conn in connections:
-        # If an error happens here the connection will be left in broken
-        # state. Once a good db connection is again available, the
-        # connection state will be cleaned up.
-        transaction.abort(conn)
-        connections[conn].close()
-
-
 # Register an event to reset saved queries when a Django request is started.
 def reset_queries(**kwargs):
     for conn in connections.all():
@@ -99,14 +85,9 @@ signals.request_started.connect(reset_queries)
 
 
 # Register an event to reset transaction state and close connections past
-# their lifetime. NB: abort() doesn't do anything outside of a transaction.
+# their lifetime.
 def close_old_connections(**kwargs):
     for conn in connections.all():
-        # Remove this when the legacy transaction management goes away.
-        try:
-            conn.abort()
-        except DatabaseError:
-            pass
         conn.close_if_unusable_or_obsolete()
 signals.request_started.connect(close_old_connections)
 signals.request_finished.connect(close_old_connections)