AddPrefObserver    41 base/prefs/pref_notifier_impl.cc void PrefNotifierImpl::AddPrefObserver(const char* path,
AddPrefObserver   309 base/prefs/pref_service.cc void PrefService::AddPrefObserver(const char* path, PrefObserver* obs) {
AddPrefObserver   146 chrome/browser/prefs/pref_metrics_service.cc void PrefMetricsService::AddPrefObserver(