MD Settings: Use FireWebUIListener() helper wherever possible.

chrome/browser/ui/webui/settings/chromeos/date_time_handler.cc

Index: chrome/browser/ui/webui/settings/chromeos/date_time_handler.cc
diff --git a/chrome/browser/ui/webui/settings/chromeos/date_time_handler.cc b/chrome/browser/ui/webui/settings/chromeos/date_time_handler.cc
index e21f0106262900163a7dd2f5e288bab4afd6cf38..2562de268c0ab780395c900a941743b0dbea0a1d 100644
--- a/chrome/browser/ui/webui/settings/chromeos/date_time_handler.cc
+++ b/chrome/browser/ui/webui/settings/chromeos/date_time_handler.cc
@@ -170,15 +170,12 @@ void DateTimeHandler::NotifyTimezoneAutomaticDetectionPolicy() {
                            ->GetTimezoneResolverManager()
                            ->ShouldApplyResolvedTimezone();
 
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("time-zone-auto-detect-policy"),
-                         base::Value(managed), base::Value(force_enabled));
+  FireWebUIListener("time-zone-auto-detect-policy", base::Value(managed),
+                    base::Value(force_enabled));
 }
 
 void DateTimeHandler::SystemClockCanSetTimeChanged(bool can_set_time) {
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("can-set-date-time-changed"),
-                         base::Value(can_set_time));
+  FireWebUIListener("can-set-date-time-changed", base::Value(can_set_time));
 }
 
 }  // namespace settings