Replace manual conversions with Mojo type mappings

services/video_capture/receiver_mojo_to_media_adapter.h

Index: services/video_capture/receiver_mojo_to_media_adapter.h
diff --git a/services/video_capture/receiver_mojo_to_media_adapter.h b/services/video_capture/receiver_mojo_to_media_adapter.h
index 85c8c2f645d20169f93c20c9dfb3e6be1daeb248..4480a1de3454108227e802cd7f35f0d22d2141b7 100644
--- a/services/video_capture/receiver_mojo_to_media_adapter.h
+++ b/services/video_capture/receiver_mojo_to_media_adapter.h
@@ -8,10 +8,6 @@
 #include "media/capture/video/video_frame_receiver.h"
 #include "services/video_capture/public/interfaces/video_frame_receiver.mojom.h"
 
-namespace media {
-class MojoSharedBufferVideoFrame;
-}
-
 namespace video_capture {
 
 // Adapter that allows a mojom::VideoFrameReceiver to be used in place of
@@ -32,7 +28,6 @@ class ReceiverMojoToMediaAdapter : public media::VideoFrameReceiver {
 
  private:
   mojom::VideoFrameReceiverPtr receiver_;
-  scoped_refptr<media::MojoSharedBufferVideoFrame> shared_buffer_frame_;
 };
 
 }  // namespace video_capture