Migrate upgrade notifications to observer

chrome/browser/chromeos/upgrade_detector_chromeos.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/upgrade_detector_chromeos.h"
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
@@ skipping 114 matching lines @@
   } else if (time_passed >= kHighThreshold) {
     set_upgrade_notification_stage(UPGRADE_ANNOYANCE_HIGH);
   } else if (time_passed >= kElevatedThreshold) {
     set_upgrade_notification_stage(UPGRADE_ANNOYANCE_ELEVATED);
   } else if (time_passed >= kLowThreshold) {
     set_upgrade_notification_stage(UPGRADE_ANNOYANCE_LOW);
   } else {
     return;  // Not ready to recommend upgrade.
   }
 
-  NotifyUpgradeRecommended();
+  NotifyUpgrade();
 }
 
 void UpgradeDetectorChromeos::OnChannelsReceived(
     const std::string& current_channel,
     const std::string& target_channel) {
   // As current update engine status is UPDATE_STATUS_UPDATED_NEED_REBOOT
   // and target channel is more stable than current channel, powerwash
   // will be performed after reboot.
   set_is_factory_reset_required(UpdateEngineClient::IsTargetChannelMoreStable(
       current_channel, target_channel));
@@ skipping 11 matching lines @@
 
 // static
 UpgradeDetectorChromeos* UpgradeDetectorChromeos::GetInstance() {
   return base::Singleton<UpgradeDetectorChromeos>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorChromeos::GetInstance();
 }