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_temporal_layers.h b/api/video_codecs/vp8_temporal_layers.h
index dcf04c6..f02d288 100644
--- a/api/video_codecs/vp8_temporal_layers.h
+++ b/api/video_codecs/vp8_temporal_layers.h
@@ -62,7 +62,7 @@
   void OnRttUpdate(int64_t rtt_ms) override;
 
   void OnLossNotification(
-      const VideoEncoder::LossNotification loss_notification) override;
+      const VideoEncoder::LossNotification& loss_notification) override;
 
  private:
   std::vector<std::unique_ptr<Vp8FrameBufferController>> controllers_;