Remove unused HTTP clients.

synapse/app/generic_worker.py

@@ -266,7 +266,6 @@ class GenericWorkerPresence(BasePresenceHandler):
         super().__init__(hs)
         self.hs = hs
         self.is_mine_id = hs.is_mine_id
-        self.http_client = hs.get_simple_http_client()
 
         self._presence_enabled = hs.config.use_presence
 

synapse/federation/federation_server.py

@@ -845,7 +845,6 @@ class FederationHandlerRegistry:
 
     def __init__(self, hs: "HomeServer"):
         self.config = hs.config
-        self.http_client = hs.get_simple_http_client()
         self.clock = hs.get_clock()
         self._instance_name = hs.get_instance_name()