Remove redundant get_current_events_token

This was an exact duplicate of `get_room_max_stream_ordering`, so let's get rid
of it.

Author: richvdh

synapse/handlers/federation_event.py

@@ -1838,7 +1838,7 @@ async def persist_events_and_notify(
             The stream ID after which all events have been persisted.
         """
         if not event_and_contexts:
-            return self._store.get_current_events_token()
+            return self._store.get_room_max_stream_ordering()
 
         instance = self._config.worker.events_shard_config.get_instance(room_id)
         if instance != self._instance_name:

synapse/handlers/presence.py

@@ -729,7 +729,7 @@ def run_persister() -> Awaitable[None]:
 
         # Presence is best effort and quickly heals itself, so lets just always
         # stream from the current state when we restart.
-        self._event_pos = self.store.get_current_events_token()
+        self._event_pos = self.store.get_room_max_stream_ordering()
         self._event_processing = False
 
     async def _on_shutdown(self) -> None:

synapse/storage/databases/main/events_worker.py

@@ -1383,10 +1383,6 @@ async def get_room_complexity(self, room_id: str) -> Dict[str, float]:
 
         return {"v1": complexity_v1}
 
-    def get_current_events_token(self) -> int:
-        """The current maximum token that events have reached"""
-        return self._stream_id_gen.get_current_token()
-
     async def get_all_new_forward_event_rows(
         self, instance_name: str, last_id: int, current_id: int, limit: int
     ) -> List[Tuple[int, str, str, str, str, str, str, str, str]]: