[Mojo Video Capture] Simplify media::VideoCaptureDevice::Client:Buffer to a struct

services/video_capture/buffer_tracker_factory_impl.cc

Index: services/video_capture/buffer_tracker_factory_impl.cc
diff --git a/services/video_capture/buffer_tracker_factory_impl.cc b/services/video_capture/buffer_tracker_factory_impl.cc
deleted file mode 100644
index 2b502ab9dd948434cb75fcefc48b95ab43ca3388..0000000000000000000000000000000000000000
--- a/services/video_capture/buffer_tracker_factory_impl.cc
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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 "services/video_capture/buffer_tracker_factory_impl.h"
-
-#include "base/memory/ptr_util.h"
-#include "services/video_capture/mojo_shared_memory_buffer_tracker.h"
-
-namespace video_capture {
-
-std::unique_ptr<media::VideoCaptureBufferTracker>
-BufferTrackerFactoryImpl::CreateTracker(media::VideoPixelStorage storage) {
-  switch (storage) {
-    case media::PIXEL_STORAGE_CPU:
-      return base::MakeUnique<MojoSharedMemoryBufferTracker>();
-  }
-  NOTREACHED();
-  return std::unique_ptr<media::VideoCaptureBufferTracker>();
-}
-
-}  // namespace video_capture