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

content/browser/renderer_host/media/video_capture_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 <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 
@@ skipping 112 matching lines @@
         observer_binding_(this) {}
 
   void SetUp() override {
     SetBrowserClientForTesting(&browser_client_);
 
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kUseFakeDeviceForMediaStream);
     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()));
 
     OpenSession();
   }
 
   void TearDown() override {
     Mock::VerifyAndClearExpectations(host_.get());
     EXPECT_TRUE(host_->controllers_.empty());
@@ skipping 222 matching lines @@
   StartCapture();
 
   // When the session is closed via the stream without stopping capture, the
   // ENDED event is sent.
   EXPECT_CALL(*this, OnStateChanged(mojom::VideoCaptureState::ENDED));
   CloseSession();
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace content