Remove unused include in sequenced_worker_pool.h

device/usb/usb_device_handle_usbfs.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_USB_USB_DEVICE_HANDLE_USBFS_H_
 #define DEVICE_USB_USB_DEVICE_HANDLE_USBFS_H_
 
 #include <list>
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "base/files/scoped_file.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "device/usb/usb_device_handle.h"
 
 struct usbdevfs_urb;
 
 namespace base {
 class SequencedTaskRunner;
 class SingleThreadTaskRunner;
 }
 
 namespace device {
@@ skipping 138 matching lines @@
   // thread's message loop is destroyed but can also be freed by this class on
   // destruction.
   FileThreadHelper* helper_;
 
   std::list<std::unique_ptr<Transfer>> transfers_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_USB_USB_DEVICE_HANDLE_USBFS_H_