Revert "Currently, base/timer.cc calls PostTask with FROM_HERE as the Location,

chrome/browser/chromeos/upgrade_detector_chromeos.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/cros/cros_library.h"
 
 namespace {
@@ skipping 19 matching lines @@
   if (library->status().status != chromeos::UPDATE_STATUS_UPDATED_NEED_REBOOT)
     return;
 
   NotifyUpgradeDetected();
 
   // 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),
+      base::TimeDelta::FromMilliseconds(kNotifyCycleTimeMs),
       this, &UpgradeDetectorChromeos::NotifyOnUpgrade);
 }
 
 void UpgradeDetectorChromeos::NotifyOnUpgrade() {
   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;
@@ skipping 20 matching lines @@
 
 // static
 UpgradeDetectorChromeos* UpgradeDetectorChromeos::GetInstance() {
   return Singleton<UpgradeDetectorChromeos>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorChromeos::GetInstance();
 }