Add DeviceSettingsService.

chrome/common/chrome_notification_types.h

 // 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.
 
 #ifndef CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_
 #define CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_
 
 #include "content/public/browser/notification_types.h"
 
 namespace chrome {
@@ skipping 1052 matching lines @@
   // os device has succeeded.
   NOTIFICATION_OWNER_KEY_FETCH_ATTEMPT_SUCCEEDED,
 
   // Sent when an attempt to acquire the public key of the owner of a chromium
   // os device has failed.
   NOTIFICATION_OWNER_KEY_FETCH_ATTEMPT_FAILED,
 
   // Sent after UserManager checked ownership status of logged in user.
   NOTIFICATION_OWNERSHIP_CHECKED,
 
+  // Sent by DeviceSettingsService to indicate that the ownership status
+  // changed. If you can, please use DeviceSettingsService::Observer instead.
+  // Other singleton-based services can't use that because Observer
+  // unregistration is impossible due to unpredictable deletion order.
+  NOTIFICATION_OWNERSHIP_STATUS_CHANGED,
+
   // This is sent to a ChromeOS settings observer when a system setting is
   // changed. The source is the CrosSettings and the details a std::string of
   // the changed setting.
   NOTIFICATION_SYSTEM_SETTING_CHANGED,
 
   // Sent by SIM unlock dialog when it has finished with the process of
   // updating RequirePin setting. RequirePin setting might have been changed
   // to a new value or update might have been canceled.
   // In either case notification is sent and details contain a bool
   // that represents current value.
@@ skipping 169 matching lines @@
   // Currently only Content and Chrome define and use notifications.
   // Custom notifications not belonging to Content and Chrome should start
   // from here.
   NOTIFICATION_CHROME_END,
 };
 
 }  // namespace chrome
 
 
 #endif  // CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_