Migrate upgrade notifications to observer

chrome/browser/chrome_notification_types.h

 // Copyright 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_BROWSER_CHROME_NOTIFICATION_TYPES_H_
 #define CHROME_BROWSER_CHROME_NOTIFICATION_TYPES_H_
 
 #include "build/build_config.h"
 #include "extensions/features/features.h"
 
@@ skipping 247 matching lines @@
 
   // Notification from PrintJob that an event occurred. It can be that a page
   // finished printing or that the print job failed. Details is
   // PrintJob::EventDetails. Source is a PrintJob.
   NOTIFICATION_PRINT_JOB_EVENT,
 
   // Sent when a PrintJob has been released.
   // Source is the WebContents that holds the print job.
   NOTIFICATION_PRINT_JOB_RELEASED,
 
-  // Upgrade notifications ---------------------------------------------------
-
-  // Sent when Chrome believes an update has been installed and available for
-  // long enough with the user shutting down to let it take effect. See
-  // upgrade_detector.cc for details on how long it waits. No details are
-  // expected.
-  NOTIFICATION_UPGRADE_RECOMMENDED,
-
-  // Sent when a critical update has been installed. No details are expected.
-  NOTIFICATION_CRITICAL_UPGRADE_INSTALLED,
-
-  // Sent when the current install is outdated. No details are expected.
-  NOTIFICATION_OUTDATED_INSTALL,
-
-  // Sent when the current install is outdated and auto-update (AU) is disabled.
-  // No details are expected.
-  NOTIFICATION_OUTDATED_INSTALL_NO_AU,
-
   // Content Settings --------------------------------------------------------
 
   // Sent when the collect cookies dialog is shown. The source is a
   // TabSpecificContentSettings object, there are no details.
   NOTIFICATION_COLLECTED_COOKIES_SHOWN,
 
   // Sent when content settings change for a tab. The source is a
   // content::WebContents object, the details are None.
   NOTIFICATION_WEB_CONTENT_SETTINGS_CHANGED,
 
@@ skipping 167 matching lines @@
   // Note:-
   // 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_BROWSER_CHROME_NOTIFICATION_TYPES_H_