Make UpgradeDetector listen to VariationsService changes.

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 "base/memory/singleton.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 
 namespace {
@@ skipping 23 matching lines @@
   if (!initialized_)
     return;
   DBusThreadManager::Get()->GetUpdateEngineClient()->RemoveObserver(this);
 }
 
 void UpgradeDetectorChromeos::UpdateStatusChanged(
     const UpdateEngineClient::Status& status) {
   if (status.status != UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT)
     return;
 
-  NotifyUpgradeDetected();
+  upgrade_detected_time_ = base::Time::Now();
 
   // ChromeOS shows upgrade arrow once the upgrade becomes available.
   NotifyOnUpgrade();
 
   // Setup timer to to move along the upgrade advisory system.
   upgrade_notification_timer_.Start(
       FROM_HERE, base::TimeDelta::FromMilliseconds(kNotifyCycleTimeMs),
       this, &UpgradeDetectorChromeos::NotifyOnUpgrade);
 }
 
 void UpgradeDetectorChromeos::NotifyOnUpgrade() {
-  base::TimeDelta delta = base::Time::Now() - upgrade_detected_time();
+  base::TimeDelta delta = base::Time::Now() - upgrade_detected_time_;
   int64 time_passed = delta.InDays();
 
   const int kSevereThreshold = 7;
   const int kHighThreshold = 4;
   const int kElevatedThreshold = 2;
   const int kLowThreshold = 0;
 
   // These if statements must be sorted (highest interval first).
   if (time_passed >= kSevereThreshold) {
     set_upgrade_notification_stage(UPGRADE_ANNOYANCE_SEVERE);
@@ skipping 15 matching lines @@
 
 // static
 UpgradeDetectorChromeos* UpgradeDetectorChromeos::GetInstance() {
   return Singleton<UpgradeDetectorChromeos>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorChromeos::GetInstance();
 }