OnLossNotification() receives references

A typo in a previous CL made OnLossNotification() accept its
single argument as a const-value, rather than a const-reference.

Bug: webrtc:10501
Change-Id: I5e6f9c79f15205b75ec90a53d3fccf3dd9927e33
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133343
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Elad Alon <eladalon@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27659}
diff --git a/api/video_codecs/vp8_frame_buffer_controller.h b/api/video_codecs/vp8_frame_buffer_controller.h
index c506fa4..f3d2b1a 100644
--- a/api/video_codecs/vp8_frame_buffer_controller.h
+++ b/api/video_codecs/vp8_frame_buffer_controller.h
@@ -140,7 +140,7 @@
 
   // Called when a loss notification is received.
   virtual void OnLossNotification(
-      const VideoEncoder::LossNotification loss_notification) = 0;
+      const VideoEncoder::LossNotification& loss_notification) = 0;
 };
 
 // Interface for a factory of Vp8FrameBufferController instances.