[Mojo Video Capture] Introduce abstraction VideoCaptureSystem

content/browser/renderer_host/media/media_devices_manager_unittest.cc

Index: content/browser/renderer_host/media/media_devices_manager_unittest.cc
diff --git a/content/browser/renderer_host/media/media_devices_manager_unittest.cc b/content/browser/renderer_host/media/media_devices_manager_unittest.cc
index 906158de55150fdbd29a8869441d3031789c547a..66abb254d77b99b7da2e04329e7fd786c8745fb3 100644
--- a/content/browser/renderer_host/media/media_devices_manager_unittest.cc
+++ b/content/browser/renderer_host/media/media_devices_manager_unittest.cc
@@ -141,8 +141,9 @@ class MediaDevicesManagerTest : public ::testing::Test {
   void SetUp() override {
     audio_manager_.reset(new MockAudioManager());
     video_capture_manager_ = new VideoCaptureManager(
-        std::unique_ptr<media::VideoCaptureDeviceFactory>(
-            new MockVideoCaptureDeviceFactory()),
+        base::MakeUnique<media::VideoCaptureSystem>(
+            std::unique_ptr<media::VideoCaptureDeviceFactory>(
+                new MockVideoCaptureDeviceFactory())),
         base::ThreadTaskRunnerHandle::Get());
     video_capture_device_factory_ = static_cast<MockVideoCaptureDeviceFactory*>(
         video_capture_manager_->video_capture_device_factory());