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

base/system_monitor/system_monitor.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 "base/system_monitor/system_monitor.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/time.h"
 
 namespace base {
 
 static SystemMonitor* g_system_monitor = NULL;
 
 #if defined(ENABLE_BATTERY_MONITORING)
 // The amount of time (in ms) to wait before running the initial
 // battery check.
 static int kDelayedBatteryCheckMs = 10 * 1000;
 #endif  // defined(ENABLE_BATTERY_MONITORING)
 
 SystemMonitor::SystemMonitor()
     : observer_list_(new ObserverListThreadSafe<PowerObserver>()),
       battery_in_use_(false),
       suspended_(false) {
   DCHECK(!g_system_monitor);
   g_system_monitor = this;
 
   DCHECK(MessageLoop::current());
 #if defined(ENABLE_BATTERY_MONITORING)
-  delayed_battery_check_.Start(FROM_HERE,
+  delayed_battery_check_.Start(
       base::TimeDelta::FromMilliseconds(kDelayedBatteryCheckMs), this,
       &SystemMonitor::BatteryCheck);
 #endif  // defined(ENABLE_BATTERY_MONITORING)
 #if defined(OS_MACOSX)
   PlatformInit();
 #endif
 }
 
 SystemMonitor::~SystemMonitor() {
 #if defined(OS_MACOSX)
@@ skipping 58 matching lines @@
 void SystemMonitor::NotifyResume() {
   VLOG(1) << "Power Resuming";
   observer_list_->Notify(&PowerObserver::OnResume);
 }
 
 void SystemMonitor::BatteryCheck() {
   ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
 }
 
 }  // namespace base