Remove Sync JS generic request/reply framework

sync/sync_core.gypi

 # Copyright 2013 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.
 
 {
   'include_dirs': [
     '..',
   ],
   'defines': [
     'SYNC_IMPLEMENTATION',
@@ skipping 75 matching lines @@
     'engine/sync_scheduler.cc',
     'engine/sync_scheduler.h',
     'engine/sync_scheduler_impl.cc',
     'engine/sync_scheduler_impl.h',
     'engine/traffic_logger.cc',
     'engine/traffic_logger.h',
     'engine/update_applicator.cc',
     'engine/update_applicator.h',
     'engine/update_handler.cc',
     'engine/update_handler.h',
-    'js/js_arg_list.cc',
-    'js/js_arg_list.h',
     'js/js_backend.h',
     'js/js_controller.h',
     '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/sync_protocol_error.cc',
     'protocol/sync_protocol_error.h',
     'sessions/data_type_tracker.cc',
     'sessions/data_type_tracker.h',
@@ skipping 84 matching lines @@
     'util/get_session_name_win.cc',
     'util/get_session_name_win.h',
     'util/logging.cc',
     'util/logging.h',
     'util/nigori.cc',
     'util/nigori.h',
     'util/time.cc',
     'util/time.h',
   ],
 }