Use the task scheduler for blocking tasks in the USB service on Linux

device/usb/usb_device_handle_android.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_ANDROID_H_
 #define DEVICE_USB_USB_DEVICE_HANDLE_ANDROID_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "base/memory/ref_counted.h"
-#include "base/sequenced_task_runner.h"
 #include "device/usb/usb_device_handle_usbfs.h"
 
 namespace device {
 
 class UsbDevice;
 
 // Extends UsbDeviceHandleUsbfs with support for managing a device connection
 // through an instance of android.hardware.usb.UsbDeviceConnection.
 class UsbDeviceHandleAndroid : public UsbDeviceHandleUsbfs {
  public:
   static scoped_refptr<UsbDeviceHandleAndroid> Create(
       JNIEnv* env,
       scoped_refptr<UsbDevice> device,
-      scoped_refptr<base::SequencedTaskRunner> blocking_task_runner,
       const base::android::JavaRef<jobject>& usb_connection);
 
  private:
   // |wrapper| is an instance of org.chromium.device.usb.ChromeUsbConnection.
   UsbDeviceHandleAndroid(
       scoped_refptr<UsbDevice> device,
       base::ScopedFD fd,
-      scoped_refptr<base::SequencedTaskRunner> blocking_task_runner,
       const base::android::JavaRef<jobject>& wrapper);
   ~UsbDeviceHandleAndroid() override;
 
   // UsbDeviceHandleUsbfs:
   void CloseBlocking() override;
 
   void CloseConnection();
 
   // Java object org.chromium.device.usb.ChromeUsbConnection.
   base::android::ScopedJavaGlobalRef<jobject> j_object_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_USB_USB_DEVICE_HANDLE_ANDROID_H_