Make VCMDecodeErrorMode optional when calling VideoCodingModule::SetReceiverRobustnessMode

This is a preparation for deleting other modes than
VCMDecodeErrorMode::kNoErrors.

Bug: webrtc:8064
Change-Id: I614f8012f306c5d59e72bdb851b582c286cdd130
Reviewed-on: https://webrtc-review.googlesource.com/c/116781
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26195}
diff --git a/modules/video_coding/include/video_coding.h b/modules/video_coding/include/video_coding.h
index cf871a0..b9da96d 100644
--- a/modules/video_coding/include/video_coding.h
+++ b/modules/video_coding/include/video_coding.h
@@ -169,6 +169,10 @@
   virtual int SetReceiverRobustnessMode(ReceiverRobustness robustnessMode,
                                         VCMDecodeErrorMode errorMode) = 0;
 
+  int SetReceiverRobustnessMode(ReceiverRobustness robustnessMode) {
+    return SetReceiverRobustnessMode(robustnessMode, kNoErrors);
+  }
+
   // Sets the maximum number of sequence numbers that we are allowed to NACK
   // and the oldest sequence number that we will consider to NACK. If a
   // sequence number older than |max_packet_age_to_nack| is missing