[Mojo Video Capture] Fix VideoCaptureManager exposing implementation details to clients

content/browser/renderer_host/media/media_devices_dispatcher_host_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 "content/browser/renderer_host/media/media_devices_dispatcher_host.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <queue>
@@ skipping 66 matching lines @@
         origin_(GURL("https://test.com")) {
     // Make sure we use fake devices to avoid long delays.
     base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
         switches::kUseFakeDeviceForMediaStream,
         base::StringPrintf("device-count=%zu, video-input-default-id=%s",
                            kNumFakeVideoDevices, kDefaultVideoDeviceID));
     audio_manager_.reset(
         new media::MockAudioManager(base::ThreadTaskRunnerHandle::Get()));
     audio_system_ = media::AudioSystemImpl::Create(audio_manager_.get());
     media_stream_manager_ =
-        base::MakeUnique<MediaStreamManager>(audio_system_.get());
+        MediaStreamManager::CreateWithDefaults(audio_system_.get());
 
     MockResourceContext* mock_resource_context =
         static_cast<MockResourceContext*>(
             browser_context_.GetResourceContext());
 
     host_ = base::MakeUnique<MediaDevicesDispatcherHost>(
         kProcessId, kRenderId, mock_resource_context->GetMediaDeviceIDSalt(),
         media_stream_manager_.get());
   }
 
@@ skipping 284 matching lines @@
   // On Windows, the underlying MediaStreamManager uses a separate thread for
   // video capture which must be flushed to guarantee that the callback bound to
   // GetVIdeoInputCapabilities above is invoked before the end of this test's
   // body.
   media_stream_manager_->FlushVideoCaptureThreadForTesting();
   base::RunLoop().RunUntilIdle();
 #endif
 }
 
 };  // namespace content