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

content/browser/renderer_host/media/video_capture_manager_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.
 
 // Unit test for VideoCaptureManager.
 
 #include "content/browser/renderer_host/media/video_capture_manager.h"
 
 #include <stdint.h>
 
@@ skipping 182 matching lines @@
     devices_ = std::move(devices);
     quit_closure.Run();
   }
 
  protected:
   void SetUp() override {
     listener_.reset(new MockMediaStreamProviderListener());
     auto video_capture_device_factory =
         base::MakeUnique<WrappedDeviceFactory>();
     video_capture_device_factory_ = video_capture_device_factory.get();
-    auto video_capture_system = base::MakeUnique<media::VideoCaptureSystem>(
+    auto video_capture_system = base::MakeUnique<media::VideoCaptureSystemImpl>(
         std::move(video_capture_device_factory));
     vcm_ = new VideoCaptureManager(std::move(video_capture_system),
                                    base::ThreadTaskRunnerHandle::Get());
     const int32_t kNumberOfFakeDevices = 2;
     video_capture_device_factory_->SetToDefaultDevicesConfig(
         kNumberOfFakeDevices);
     vcm_->RegisterListener(listener_.get());
     frame_observer_.reset(new MockFrameObserver());
 
     base::RunLoop run_loop;
@@ skipping 573 matching lines @@
   // Wait to check callbacks before removing the listener.
   base::RunLoop().RunUntilIdle();
   vcm_->UnregisterListener(listener_.get());
 }
 #endif
 
 // TODO(mcasas): Add a test to check consolidation of the supported formats
 // provided by the device when http://crbug.com/323913 is closed.
 
 }  // namespace content