Update policy description for SystemUse24HourClock policy.

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/chromeos/system/ash_system_tray_delegate.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 941 matching lines @@
   void UnobserveDriveUpdates() {
     DriveIntegrationService* integration_service =
         FindDriveIntegrationService();
     if (integration_service)
       integration_service->job_list()->RemoveObserver(this);
   }
 
   bool ShouldUse24HourClock() const {
     // On login screen and in guest mode owner default is used for
     // kUse24HourClock preference.
-    // All other modes default to the default locale value.
     const ash::user::LoginStatus status = GetUserLoginStatus();
     const CrosSettings* const cros_settings = CrosSettings::Get();
     bool system_use_24_hour_clock = true;
     const bool system_value_found = cros_settings->GetBoolean(
         kSystemUse24HourClock, &system_use_24_hour_clock);
 
     if (status == ash::user::LOGGED_IN_NONE)
       return (system_value_found ? system_use_24_hour_clock : true);
 
     const PrefService::Preference* user_pref =
@@ skipping 382 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegate);
 };
 
 }  // namespace
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate() {
   return new chromeos::SystemTrayDelegate();
 }
 
 }  // namespace chromeos