make new syncer thread the default.

chrome/chrome.gyp

 # Copyright (c) 2011 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,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 516 matching lines @@
         'browser/sync/engine/store_timestamps_command.cc',
         'browser/sync/engine/store_timestamps_command.h',
         'browser/sync/engine/syncer.cc',
         'browser/sync/engine/syncer.h',
         'browser/sync/engine/syncer_command.cc',
         'browser/sync/engine/syncer_command.h',
         'browser/sync/engine/syncer_end_command.cc',
         'browser/sync/engine/syncer_end_command.h',
         'browser/sync/engine/syncer_proto_util.cc',
         'browser/sync/engine/syncer_proto_util.h',
-        'browser/sync/engine/syncer_thread_adapter.cc',
-        'browser/sync/engine/syncer_thread_adapter.h',
-        'browser/sync/engine/syncer_thread2.cc',
-        'browser/sync/engine/syncer_thread2.h',
         'browser/sync/engine/syncer_thread.cc',
         'browser/sync/engine/syncer_thread.h',
         'browser/sync/engine/syncer_types.h',
         'browser/sync/engine/syncer_util.cc',
         'browser/sync/engine/syncer_util.h',
         'browser/sync/engine/syncproto.h',
         'browser/sync/engine/update_applicator.cc',
         'browser/sync/engine/update_applicator.h',
         'browser/sync/engine/verify_updates_command.cc',
         'browser/sync/engine/verify_updates_command.h',
@@ skipping 1010 matching lines @@
       }],  # targets
     }],  # OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"
   ],  # 'conditions'
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: