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

services/video_capture/receiver_mojo_to_media_adapter.h

 // 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_RECEIVER_MOJO_TO_MEDIA_ADAPTER_H_
 #define SERVICES_VIDEO_CAPTURE_RECEIVER_MOJO_TO_MEDIA_ADAPTER_H_
 
 #include "media/capture/video/video_frame_receiver.h"
 #include "services/video_capture/public/interfaces/receiver.mojom.h"
 
 namespace video_capture {
 
 // Adapter that allows a mojom::VideoFrameReceiver to be used in place of
 // a media::VideoFrameReceiver.
 class ReceiverMojoToMediaAdapter : public media::VideoFrameReceiver {
  public:
   ReceiverMojoToMediaAdapter(mojom::ReceiverPtr receiver);
   ~ReceiverMojoToMediaAdapter() override;
 
   // media::VideoFrameReceiver:
   void OnIncomingCapturedVideoFrame(
-      std::unique_ptr<media::VideoCaptureDevice::Client::Buffer> buffer,
+      media::VideoCaptureDevice::Client::Buffer buffer,
       scoped_refptr<media::VideoFrame> frame) override;
   void OnError() override;
   void OnLog(const std::string& message) override;
   void OnBufferDestroyed(int buffer_id_to_drop) override;
 
  private:
   mojom::ReceiverPtr receiver_;
 };
 
 }  // namespace video_capture
 
 #endif  // SERVICES_VIDEO_CAPTURE_RECEIVER_MOJO_TO_MEDIA_ADAPTER_H_