Use the task scheduler in the new Windows USB backend

device/usb/usb_service_unittest.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 <memory>
 
 #include "base/bind.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/scoped_feature_list.h"
 #include "base/test/scoped_task_environment.h"
 #include "base/test/test_io_thread.h"
 #include "device/base/features.h"
 #include "device/test/test_device_client.h"
 #include "device/test/usb_test_gadget.h"
 #include "device/usb/usb_device.h"
 #include "device/usb/usb_device_handle.h"
 #include "device/usb/usb_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace device {
 
 namespace {
 
 class UsbServiceTest : public ::testing::Test {
  public:
   UsbServiceTest()
       : scoped_task_environment_(
             base::test::ScopedTaskEnvironment::MainThreadType::UI),
-        io_thread_(base::TestIOThread::kAutoStart) {}
-
-  void SetUp() override {
-    device_client_.reset(new TestDeviceClient(io_thread_.task_runner()));
-  }
+        io_thread_(base::TestIOThread::kAutoStart),
+        device_client_(new TestDeviceClient()) {}
 
  protected:
   base::test::ScopedTaskEnvironment scoped_task_environment_;
   base::TestIOThread io_thread_;

[mcasas, 2017/05/16 21:24:24]

nit: probably const, and |scoped_task_environment_| as well.

   std::unique_ptr<TestDeviceClient> device_client_;
 };
 
 void OnGetDevices(const base::Closure& quit_closure,
                   const std::vector<scoped_refptr<UsbDevice>>& devices) {
   quit_closure.Run();
 }
 
 void OnOpen(scoped_refptr<UsbDeviceHandle>* output,
             const base::Closure& quit_closure,
@@ skipping 66 matching lines @@
   ASSERT_TRUE(device_handle);
 
   // Shut down the USB service while the device handle is still open.
   device_client_.reset();
   EXPECT_FALSE(device_handle->GetDevice());
 }
 
 }  // namespace
 
 }  // namespace device