Use ScopedTaskEnvironment instead of MessageLoop in media/capture/ unit tests

media/capture/video/video_capture_device_unittest.cc

 // Copyright (c) 2012 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 "media/capture/video/video_capture_device.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/test/test_timeouts.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/capture/video/video_capture_device_factory.h"
 #include "media/capture/video_capture_types.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 177 matching lines @@
   mojom::PhotoCapabilitiesPtr capabilities_;
 };
 
 }  // namespace
 
 class VideoCaptureDeviceTest : public testing::TestWithParam<gfx::Size> {
  protected:
   typedef VideoCaptureDevice::Client Client;
 
   VideoCaptureDeviceTest()
-      : loop_(new base::MessageLoop()),
-        device_descriptors_(new VideoCaptureDeviceDescriptors()),
+      : device_descriptors_(new VideoCaptureDeviceDescriptors()),
         video_capture_client_(new MockVideoCaptureClient(
             base::Bind(&VideoCaptureDeviceTest::OnFrameCaptured,
                        base::Unretained(this)))),
         image_capture_client_(new MockImageCaptureClient()),
         video_capture_device_factory_(VideoCaptureDeviceFactory::CreateFactory(
             base::ThreadTaskRunnerHandle::Get())) {}
 
   void SetUp() override {
 #if defined(OS_ANDROID)
     VideoCaptureDeviceAndroid::RegisterVideoCaptureDevice(
@@ skipping 80 matching lines @@
     if (it == supported_formats.end()) {
       DVLOG(1) << "Size " << size.ToString() << " is not supported.";
       return false;
     }
     return true;
   }
 
 #if defined(OS_WIN)
   base::win::ScopedCOMInitializer initialize_com_;
 #endif
-  const std::unique_ptr<base::MessageLoop> loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<VideoCaptureDeviceDescriptors> device_descriptors_;
   std::unique_ptr<base::RunLoop> run_loop_;
   std::unique_ptr<MockVideoCaptureClient> video_capture_client_;
   const scoped_refptr<MockImageCaptureClient> image_capture_client_;
   VideoCaptureFormat last_format_;
   const std::unique_ptr<VideoCaptureDeviceFactory>
       video_capture_device_factory_;
 };
 
 // Cause hangs on Windows Debug. http://crbug.com/417824
@@ skipping 282 matching lines @@
 
   device->GetPhotoCapabilities(std::move(scoped_get_callback));
   run_loop.Run();
 
   ASSERT_TRUE(image_capture_client_->capabilities());
 
   device->StopAndDeAllocate();
 }
 
 };  // namespace media