AddSyncPrefObserver  258 chrome/browser/sync/profile_sync_service.cc   sync_prefs_.AddSyncPrefObserver(this);
AddSyncPrefObserver   61 components/sync_driver/sync_prefs.h   void AddSyncPrefObserver(SyncPrefObserver* sync_pref_observer);
AddSyncPrefObserver  244 components/sync_driver/sync_prefs_unittest.cc   sync_prefs.AddSyncPrefObserver(&mock_sync_pref_observer);