Componentize SyncBackendHostImpl unittest

chrome/chrome_tests_unit.gypi

 # Copyright 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': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 213 matching lines @@
       'browser/signin/test_signin_client_builder.cc',
       'browser/ssl/security_state_model_unittest.cc',
       'browser/ssl/ssl_error_handler_unittest.cc',
       'browser/status_icons/status_icon_menu_model_unittest.cc',
       'browser/status_icons/status_icon_unittest.cc',
       'browser/status_icons/status_tray_unittest.cc',
       'browser/storage/durable_storage_permission_context_unittest.cc',
       'browser/sync/abstract_profile_sync_service_test.cc',
       'browser/sync/abstract_profile_sync_service_test.h',
       'browser/sync/glue/search_engine_data_type_controller_unittest.cc',
-      'browser/sync/glue/sync_backend_host_impl_unittest.cc',
       'browser/sync/profile_sync_service_autofill_unittest.cc',
       'browser/sync/profile_sync_service_bookmark_unittest.cc',
       'browser/sync/profile_sync_service_factory_unittest.cc',
       'browser/sync/profile_sync_service_startup_unittest.cc',
       'browser/sync/profile_sync_service_typed_url_unittest.cc',
       'browser/sync/sync_startup_tracker_unittest.cc',
       'browser/sync/test/test_http_bridge_factory.cc',
       'browser/sync/test/test_http_bridge_factory.h',
       'browser/sync/test_profile_sync_service.cc',
       'browser/sync/test_profile_sync_service.h',
@@ skipping 2780 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }