[Sync] Refactored ProfileSyncService and remove its backend() function

chrome/chrome_tests.gypi

 # 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 1357 matching lines @@
         'browser/sessions/session_service_unittest.cc',
         'browser/shell_integration_unittest.cc',
         'browser/speech/endpointer/endpointer_unittest.cc',
         'browser/speech/speech_input_bubble_controller_unittest.cc',
         'browser/speech/speech_recognition_request_unittest.cc',
         'browser/speech/speech_recognizer_unittest.cc',
         'browser/spellchecker_platform_engine_unittest.cc',
         'browser/ssl/ssl_host_state_unittest.cc',
         'browser/status_icons/status_icon_unittest.cc',
         'browser/status_icons/status_tray_unittest.cc',
+        'browser/sync/abstract_profile_sync_service_test.cc',
         'browser/sync/abstract_profile_sync_service_test.h',
         'browser/sync/glue/autofill_data_type_controller_unittest.cc',
         'browser/sync/glue/autofill_model_associator_unittest.cc',
         'browser/sync/glue/autofill_profile_model_associator_unittest.cc',
         'browser/sync/glue/bookmark_data_type_controller_unittest.cc',
         'browser/sync/glue/change_processor_mock.cc',
         'browser/sync/glue/change_processor_mock.h',
         'browser/sync/glue/data_type_controller_mock.cc',
         'browser/sync/glue/data_type_controller_mock.h',
         'browser/sync/glue/data_type_manager_impl_unittest.cc',
@@ skipping 2242 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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