Remove unused VideoReceiveStream::Config::AddRtxBinding.

Looks unused now?

Bug: None
Change-Id: Ic1567f17ee08278ff45f8d185ab8859515a840c7
Reviewed-on: https://webrtc-review.googlesource.com/c/116488
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26172}
diff --git a/call/video_receive_stream.h b/call/video_receive_stream.h
index 8388356..54af2bd 100644
--- a/call/video_receive_stream.h
+++ b/call/video_receive_stream.h
@@ -180,11 +180,6 @@
       // Map from rtx payload type -> media payload type.
       // For RTX to be enabled, both an SSRC and this mapping are needed.
       std::map<int, int> rtx_associated_payload_types;
-      // TODO(nisse): This is a temporary accessor function to enable
-      // reversing and renaming of the rtx_payload_types mapping.
-      void AddRtxBinding(int rtx_payload_type, int media_payload_type) {
-        rtx_associated_payload_types[rtx_payload_type] = media_payload_type;
-      }
 
       // RTP header extensions used for the received stream.
       std::vector<RtpExtension> extensions;