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

content/browser/renderer_host/media/video_capture_unittest.cc

Index: content/browser/renderer_host/media/video_capture_unittest.cc
diff --git a/content/browser/renderer_host/media/video_capture_unittest.cc b/content/browser/renderer_host/media/video_capture_unittest.cc
index c8ea3c0440e8a73fcfa7f37579201b119c74d7db..f5065cc4296ce28a3b2c41281c39d9f7ef7a39ff 100644
--- a/content/browser/renderer_host/media/video_capture_unittest.cc
+++ b/content/browser/renderer_host/media/video_capture_unittest.cc
@@ -130,7 +130,7 @@ class VideoCaptureTest : public testing::Test,
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kUseFakeUIForMediaStream);
     media_stream_manager_ =
-        base::MakeUnique<MediaStreamManager>(audio_system_.get());
+        MediaStreamManager::CreateWithDefaults(audio_system_.get());
 
     // Create a Host and connect it to a simulated IPC channel.
     host_.reset(new VideoCaptureHost(media_stream_manager_.get()));