Migrate upgrade notifications to observer

chrome/browser/upgrade_detector_impl.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/upgrade_detector_impl.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
@@ skipping 476 matching lines @@
       set_upgrade_notification_stage(UPGRADE_ANNOYANCE_HIGH);
     } else if (time_passed >= elevated_threshold) {
       set_upgrade_notification_stage(UPGRADE_ANNOYANCE_ELEVATED);
     } else if (time_passed >= low_threshold) {
       set_upgrade_notification_stage(UPGRADE_ANNOYANCE_LOW);
     } else {
       return;  // Not ready to recommend upgrade.
     }
   }
 
-  NotifyUpgradeRecommended();
+  NotifyUpgrade();
 }
 
 void UpgradeDetectorImpl::NotifyOnUpgrade() {
   const base::TimeDelta time_passed =
       base::TimeTicks::Now() - upgrade_detected_time_;
   NotifyOnUpgradeWithTimePassed(time_passed);
 }
 
 // static
 UpgradeDetectorImpl* UpgradeDetectorImpl::GetInstance() {
   return base::Singleton<UpgradeDetectorImpl>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorImpl::GetInstance();
 }