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

services/video_capture/buffer_tracker_factory_impl.h

Index: services/video_capture/buffer_tracker_factory_impl.h
diff --git a/services/video_capture/buffer_tracker_factory_impl.h b/services/video_capture/buffer_tracker_factory_impl.h
deleted file mode 100644
index 8914349fff7ccdac87849f881199529dd0084baa..0000000000000000000000000000000000000000
--- a/services/video_capture/buffer_tracker_factory_impl.h
+++ /dev/null
@@ -1,26 +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.
-
-#ifndef SERVICES_VIDEO_CAPTURE_BUFFER_TRACKER_FACTORY_IMPL_H_
-#define SERVICES_VIDEO_CAPTURE_BUFFER_TRACKER_FACTORY_IMPL_H_
-
-#include <memory>
-
-#include "media/capture/video/video_capture_buffer_tracker_factory.h"
-
-namespace video_capture {
-
-// Implementation of media::VideoCaptureBufferTrackerFactory specific to the
-// Mojo Video Capture service. It produces buffers that are backed by
-// mojo shared memory.
-class BufferTrackerFactoryImpl
-    : public media::VideoCaptureBufferTrackerFactory {
- public:
-  std::unique_ptr<media::VideoCaptureBufferTracker> CreateTracker(
-      media::VideoPixelStorage storage) override;
-};
-
-}  // namespace video_capture
-
-#endif  // SERVICES_VIDEO_CAPTURE_BUFFER_TRACKER_FACTORY_IMPL_H_