Move the AS handler out of the Handlers object.

Access it directly from the homeserver itself. It already wasn't
inheriting from BaseHandler storing it on the Handlers object was
already somewhat dubious.

synapse/appservice/scheduler.py

@@ -56,22 +56,22 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-class AppServiceScheduler(object):
+class ApplicationServiceScheduler(object):
     """ Public facing API for this module. Does the required DI to tie the
     components together. This also serves as the "event_pool", which in this
     case is a simple array.
     """
 
-    def __init__(self, clock, store, as_api):
-        self.clock = clock
-        self.store = store
-        self.as_api = as_api
+    def __init__(self, hs):
+        self.clock = hs.get_clock()
+        self.store = hs.get_datastore()
+        self.as_api = hs.get_application_service_api()
 
         def create_recoverer(service, callback):
-            return _Recoverer(clock, store, as_api, service, callback)
+            return _Recoverer(self.clock, self.store, self.as_api, service, callback)
 
         self.txn_ctrl = _TransactionController(
-            clock, store, as_api, create_recoverer
+            self.clock, self.store, self.as_api, create_recoverer
         )
         self.queuer = _ServiceQueuer(self.txn_ctrl)