Remove unused on_query_auth which should have been removed in #7026.

synapse/handlers/federation.py

@@ -2303,37 +2303,6 @@ async def _check_for_soft_fail(
             logger.warning("Soft-failing %r because %s", event, e)
             event.internal_metadata.soft_failed = True
 
-    async def on_query_auth(
-        self, origin, event_id, room_id, remote_auth_chain, rejects, missing
-    ):
-        in_room = await self.auth.check_host_in_room(room_id, origin)
-        if not in_room:
-            raise AuthError(403, "Host not in room.")
-
-        event = await self.store.get_event(event_id, check_room_id=room_id)
-
-        # Just go through and process each event in `remote_auth_chain`. We
-        # don't want to fall into the trap of `missing` being wrong.
-        for e in remote_auth_chain:
-            try:
-                await self._handle_new_event(origin, e)
-            except AuthError:
-                pass
-
-        # Now get the current auth_chain for the event.
-        local_auth_chain = await self.store.get_auth_chain(
-            room_id, list(event.auth_event_ids()), include_given=True
-        )
-
-        # TODO: Check if we would now reject event_id. If so we need to tell
-        # everyone.
-
-        ret = await self.construct_auth_difference(local_auth_chain, remote_auth_chain)
-
-        logger.debug("on_query_auth returning: %s", ret)
-
-        return ret
-
     async def on_get_missing_events(
         self,
         origin: str,