Use TimeTicks::Now() instead of Time::Now() in upgrade detector.

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 <string>
 
 #include "base/bind.h"
 #include "base/build_time.h"
@@ skipping 341 matching lines @@
       base::TimeDelta::FromMilliseconds(GetCheckForUpgradeEveryMs()),
       this, &UpgradeDetectorImpl::CheckForUpgrade);
 }
 
 void UpgradeDetectorImpl::StartUpgradeNotificationTimer() {
   // The timer may already be running (e.g. due to both a software upgrade and
   // experiment updates being available).
   if (upgrade_notification_timer_.IsRunning())
     return;
 
-  upgrade_detected_time_ = base::Time::Now();
+  upgrade_detected_time_ = base::TimeTicks::Now();
 
   // Start the repeating timer for notifying the user after a certain period.
   // The called function will eventually figure out that enough time has passed
   // and stop the timer.
   const int cycle_time_ms = IsTesting() ?
       kNotifyCycleTimeForTestingMs : kNotifyCycleTimeMs;
   upgrade_notification_timer_.Start(FROM_HERE,
       base::TimeDelta::FromMilliseconds(cycle_time_ms),
       this, &UpgradeDetectorImpl::NotifyOnUpgrade);
 }
@@ skipping 132 matching lines @@
     } else {
       return;  // Not ready to recommend upgrade.
     }
   }
 
   NotifyUpgradeRecommended();
 }
 
 void UpgradeDetectorImpl::NotifyOnUpgrade() {
   const base::TimeDelta time_passed =
-      base::Time::Now() - upgrade_detected_time_;
+      base::TimeTicks::Now() - upgrade_detected_time_;
   NotifyOnUpgradeWithTimePassed(time_passed);
 }
 
 // static
 UpgradeDetectorImpl* UpgradeDetectorImpl::GetInstance() {
   return Singleton<UpgradeDetectorImpl>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorImpl::GetInstance();
 }