Replace changes_channel with an observer list.

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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' : {
     'browser_tests_sources_views_specific': [
       'browser/extensions/browser_action_test_util_views.cc',
       'browser/views/browser_actions_container_browsertest.cc',
     ],
@@ skipping 1829 matching lines @@
         'browser/sync/engine/verify_updates_command_unittest.cc',
         'browser/sync/glue/change_processor_mock.h',
         'browser/sync/profile_sync_factory_mock.cc',
         'browser/sync/profile_sync_factory_mock.h',
         'browser/sync/sessions/ordered_commit_set_unittest.cc',
         'browser/sync/sessions/status_controller_unittest.cc',
         'browser/sync/sessions/sync_session_unittest.cc',
         'browser/sync/syncable/directory_backing_store_unittest.cc',
         'browser/sync/syncable/syncable_id_unittest.cc',
         'browser/sync/syncable/syncable_unittest.cc',
+        'browser/sync/util/channel_unittest.cc',
         'browser/sync/util/crypto_helpers_unittest.cc',
         'browser/sync/util/extensions_activity_monitor_unittest.cc',
         'browser/sync/util/user_settings_unittest.cc',
         'test/file_test_utils.cc',
         'test/sync/engine/mock_gaia_authenticator.cc',
         'test/sync/engine/mock_gaia_authenticator.h',
         'test/sync/engine/mock_gaia_authenticator_unittest.cc',
         'test/sync/engine/mock_server_connection.cc',
         'test/sync/engine/mock_server_connection.h',
         'test/sync/engine/syncer_command_test.h',
@@ skipping 640 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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