[Sync] Replace TalkMediator*/MediatorThread* with PushClient

sync/sync.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     # The core sync library.
@@ skipping 91 matching lines @@
         'js/js_event_details.cc',
         'js/js_event_details.h',
         'js/js_event_handler.h',
         'js/js_reply_handler.h',
         'js/sync_js_controller.cc',
         'js/sync_js_controller.h',
         'protocol/proto_enum_conversions.cc',
         'protocol/proto_enum_conversions.h',
         'protocol/proto_value_conversions.cc',
         'protocol/proto_value_conversions.h',
-        'protocol/service_constants.h',
         'protocol/sync_protocol_error.cc',
         'protocol/sync_protocol_error.h',
         'sessions/debug_info_getter.h',
         'sessions/ordered_commit_set.cc',
         'sessions/ordered_commit_set.h',
         'sessions/session_state.cc',
         'sessions/session_state.h',
         'sessions/status_controller.cc',
         'sessions/status_controller.h',
         'sessions/sync_session.cc',
@@ skipping 606 matching lines @@
         '../net/net.gyp:net_test_support',
         'sync',
         'sync_notifier',
       ],
       'sources': [
         'tools/sync_listen_notifications.cc',
       ],
     },
   ],
 }