Automated IWYU fix for TaskRunner includes.

device/generic_sensor/linux/sensor_device_manager.h

 // Copyright 2016 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.
 
 #ifndef DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_
 #define DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_
 
 #include "base/scoped_observer.h"
 
+#include "base/single_thread_task_runner.h"
 #include "device/base/device_monitor_linux.h"
 #include "device/generic_sensor/generic_sensor_export.h"
 #include "device/generic_sensor/public/interfaces/sensor.mojom.h"
 
 namespace device {
 
 struct SensorInfoLinux;
 
 // This SensorDeviceManager uses LinuxDeviceMonitor to enumerate devices
 // and listen to "add/removed" events to notify |provider_| about
@@ skipping 56 matching lines @@
 
   // A task runner, which |delegate_| lives on.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SensorDeviceManager);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_