Fix non-working battery status manager on Linux.

device/battery/battery_status_manager_linux.cc

 // Copyright 2014 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 "device/battery/battery_status_manager_linux.h"
 
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
 #include "base/threading/thread.h"
 #include "base/values.h"
@@ skipping 256 matching lines @@
  public:
   explicit BatteryStatusManagerLinux(
       const BatteryStatusService::BatteryUpdateCallback& callback)
       : callback_(callback) {}
 
   ~BatteryStatusManagerLinux() override {}
 
  private:
   // BatteryStatusManager:
   bool StartListeningBatteryChange() override {
+    if (!StartNotifierThreadIfNecessary())
       return false;
 
     notifier_thread_->message_loop()->PostTask(
         FROM_HERE,
         base::Bind(&BatteryStatusNotificationThread::StartListening,
                    base::Unretained(notifier_thread_.get())));
     return true;
   }
 
   void StopListeningBatteryChange() override {
@@ skipping 77 matching lines @@
 }
 
 // static
 scoped_ptr<BatteryStatusManager> BatteryStatusManager::Create(
     const BatteryStatusService::BatteryUpdateCallback& callback) {
   return scoped_ptr<BatteryStatusManager>(
       new BatteryStatusManagerLinux(callback));
 }
 
 }  // namespace device