[Mojo Video Capture] Simplify API and some cleanups

services/video_capture/mock_device_video_capture_service_unittest.cc

-// 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.
-
-#include "base/run_loop.h"
-#include "services/video_capture/mock_device_video_capture_service_test.h"
-
-using testing::_;
-using testing::InvokeWithoutArgs;
-
-namespace video_capture {
-
-// Tests that the service stops the capture device when the client closes the
-// connection to the device proxy.
-TEST_F(MockDeviceVideoCaptureServiceTest,
-       DeviceIsStoppedWhenDiscardingDeviceProxy) {
-  base::RunLoop wait_loop;
-
-  EXPECT_CALL(*mock_device_, AllocateAndStartPtr(_));
-  EXPECT_CALL(*mock_device_, StopAndDeAllocate())
-      .WillOnce(InvokeWithoutArgs([&wait_loop]() { wait_loop.Quit(); }));
-
-  device_proxy_->Start(requested_format_,
-                       media::RESOLUTION_POLICY_FIXED_RESOLUTION,
-                       media::PowerLineFrequency::FREQUENCY_DEFAULT,
-                       std::move(mock_receiver_proxy_));
-  device_proxy_.reset();
-
-  wait_loop.Run();
-}
-
-// Tests that the service stops the capture device when the client closes the
-// connection to the client proxy it provided to the service.
-TEST_F(MockDeviceVideoCaptureServiceTest,
-       DeviceIsStoppedWhenDiscardingDeviceClient) {
-  base::RunLoop wait_loop;
-
-  EXPECT_CALL(*mock_device_, AllocateAndStartPtr(_));
-  EXPECT_CALL(*mock_device_, StopAndDeAllocate())
-      .WillOnce(InvokeWithoutArgs([&wait_loop]() { wait_loop.Quit(); }));
-
-  device_proxy_->Start(requested_format_,
-                       media::RESOLUTION_POLICY_FIXED_RESOLUTION,
-                       media::PowerLineFrequency::FREQUENCY_DEFAULT,
-                       std::move(mock_receiver_proxy_));
-  mock_receiver_.reset();
-
-  wait_loop.Run();
-}
-
-}  // namespace video_capture