Make UpgradeDetector listen to VariationsService changes.

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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1764 matching lines @@
         'browser/ui/webui/signin/login_ui_service_unittest.cc',
         'browser/ui/webui/sync_setup_handler_unittest.cc',
         'browser/ui/webui/theme_source_unittest.cc',
         'browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc',
         'browser/ui/window_sizer/window_sizer_ash_unittest.cc',
         'browser/ui/window_sizer/window_sizer_common_unittest.cc',
         'browser/ui/window_sizer/window_sizer_unittest.cc',
         'browser/ui/zoom/zoom_controller_unittest.cc',
         'browser/undo/bookmark_undo_service_test.cc',
         'browser/undo/undo_manager_test.cc',
+        'browser/upgrade_detector_impl_unittest.cc',
         'browser/upload_list_unittest.cc',
         'browser/web_applications/web_app_mac_unittest.mm',
         'browser/web_applications/web_app_unittest.cc',
         'browser/web_resource/eula_accepted_notifier_unittest.cc',
         'browser/web_resource/promo_resource_service_mobile_ntp_unittest.cc',
         'browser/web_resource/promo_resource_service_unittest.cc',
         'browser/web_resource/resource_request_allowed_notifier_test_util.cc',
         'browser/web_resource/resource_request_allowed_notifier_test_util.h',
         'browser/web_resource/resource_request_allowed_notifier_unittest.cc',
         'browser/webdata/keyword_table_unittest.cc',
@@ skipping 514 matching lines @@
             'browser/profiles/profile_list_desktop_unittest.cc',
             'browser/safe_browsing/download_protection_service_unittest.cc',
             'browser/shell_integration_linux_unittest.cc',
             'browser/signin/signin_global_error_unittest.cc',
             'browser/signin/signin_manager_unittest.cc',
             'browser/signin/signin_names_io_thread_unittest.cc',
             'browser/sync/sync_global_error_unittest.cc',
             'browser/ui/sync/one_click_signin_helper_unittest.cc',
             'browser/ui/sync/one_click_signin_sync_starter_unittest.cc',
             'browser/ui/views/frame/opaque_browser_frame_view_layout_unittest.cc',
+            'browser/upgrade_detector_impl_unittest.cc',
           ],
           'sources': [
             'browser/extensions/updater/local_extension_cache_unittest.cc',
             'browser/metrics/chromeos_metrics_provider_unittest.cc',
           ],
           'sources/': [
             ['exclude', '^browser/ui/views/app_list/linux/'],
           ],
         }, { # else: chromeos == 0
           'sources/': [
@@ skipping 236 matching lines @@
             'browser/ui/search/search_tab_helper_unittest.cc',
             'browser/ui/tab_contents/tab_contents_iterator_unittest.cc',
             'browser/ui/toolbar/recent_tabs_sub_menu_model_unittest.cc',
             'browser/ui/toolbar/toolbar_model_unittest.cc',
             'browser/ui/toolbar/wrench_menu_model_unittest.cc',
             'browser/ui/website_settings/permission_menu_model_unittest.cc',
             'browser/ui/webui/ntp/suggestions_combiner_unittest.cc',
             'browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc',
             'browser/ui/window_sizer/window_sizer_common_unittest.cc',
             'browser/ui/window_sizer/window_sizer_unittest.cc',
+            'browser/upgrade_detector_impl_unittest.cc',
             'common/net/x509_certificate_model_unittest.cc',
             'test/base/browser_with_test_window_test.cc',
             'test/base/browser_with_test_window_test.h',
             'test/base/test_browser_window.h',
 
             'browser/sessions/persistent_tab_restore_service_unittest.cc',
             'browser/sessions/session_backend_unittest.cc',
 
             # Test files cannot be opened on Android.
             'browser/drive/fake_drive_service_unittest.cc',
@@ skipping 285 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }