Delete unused method VideoCodingModule::DiscardedPackets().

webrtc/modules/video_coding/video_receiver.cc

Index: webrtc/modules/video_coding/video_receiver.cc
diff --git a/webrtc/modules/video_coding/video_receiver.cc b/webrtc/modules/video_coding/video_receiver.cc
index 6a4819eb1db0cf1f1cbfa820f372c24ff2097739..3478bf727266e599dc163038ed4f55da52d598c1 100644
--- a/webrtc/modules/video_coding/video_receiver.cc
+++ b/webrtc/modules/video_coding/video_receiver.cc
@@ -420,10 +420,6 @@ int32_t VideoReceiver::Delay() const {
   return _timing->TargetVideoDelay();
 }
 
-uint32_t VideoReceiver::DiscardedPackets() const {
-  return _receiver.DiscardedPackets();
-}
-
 int VideoReceiver::SetReceiverRobustnessMode(
     ReceiverRobustness robustnessMode,
     VCMDecodeErrorMode decode_error_mode) {