Use the task scheduler in the USB service on macOS and Windows

device/usb/usb_device_impl.h

 // 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.
 
 #ifndef DEVICE_USB_USB_DEVICE_IMPL_H_
 #define DEVICE_USB_USB_DEVICE_IMPL_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 52 matching lines @@
 
   PlatformUsbDevice platform_device() const { return platform_device_; }
 
  protected:
   friend class UsbServiceImpl;
   friend class UsbDeviceHandleImpl;
 
   // Called by UsbServiceImpl only;
   UsbDeviceImpl(scoped_refptr<UsbContext> context,
                 PlatformUsbDevice platform_device,
-                const libusb_device_descriptor& descriptor,
-                scoped_refptr<base::SequencedTaskRunner> blocking_task_runner);
+                const libusb_device_descriptor& descriptor);
 
   ~UsbDeviceImpl() override;
 
   void ReadAllConfigurations();
   void RefreshActiveConfiguration();
 
   // Called only by UsbServiceImpl.
   void set_visited(bool visited) { visited_ = visited; }
   bool was_visited() const { return visited_; }
 
  private:
   void GetAllConfigurations();
-  void OpenOnBlockingThread(const OpenCallback& callback);
+  void OpenOnBlockingThread(
+      const OpenCallback& callback,
+      scoped_refptr<base::TaskRunner> task_runner,
+      scoped_refptr<base::SequencedTaskRunner> blocking_task_runner);
   void Opened(PlatformUsbDeviceHandle platform_handle,
-              const OpenCallback& callback);
+              const OpenCallback& callback,
+              scoped_refptr<base::SequencedTaskRunner> blocking_task_runner);
 
   base::ThreadChecker thread_checker_;
   PlatformUsbDevice platform_device_;
   bool visited_ = false;
 
   // Retain the context so that it will not be released before UsbDevice.
   scoped_refptr<UsbContext> context_;
 
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
-
   DISALLOW_COPY_AND_ASSIGN(UsbDeviceImpl);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_USB_USB_DEVICE_IMPL_H_