buildbucket: bypass Cloud Endpoints API server

scripts/master/buildbucket/__init__.py

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """buildbucket module implements buildbucket-buildbot integration.
 
 The main entry point is buildbucket.setup() that accepts master configuration
 dict with other buildbucket parameters and configures master to run builds
 scheduled on buildbucket service.
 
@@ skipping 61 matching lines @@
   assert all(isinstance(b, basestring) for b in buckets), (
         'all buckets must be strings')
 
   if dry_run is None:
     dry_run = 'POLLER_DRY_RUN' in os.environ
 
   integrator = BuildBucketIntegrator(
       buckets, build_params_hook=build_params_hook,
       max_lease_count=max_lease_count)
 
-  buildbucket_service_factory = functools.partial(
-      client.create_buildbucket_service, active_master, buildbucket_hostname,
-      verbose)
+  buildbucket_service = client.create_buildbucket_service(
+      active_master, buildbucket_hostname, verbose)
 
   poller = BuildBucketPoller(
       integrator=integrator,
       poll_interval=poll_interval,
       dry_run=dry_run)
   status = BuildBucketStatus(
       integrator,
-      buildbucket_service_factory=buildbucket_service_factory,
+      buildbucket_service,
       dry_run=dry_run)
   config.setdefault('change_source', []).append(poller)
   config.setdefault('status', []).append(status)