WebRtcVoiceMediaChannel::AddRecvStream: Don't call SetRecPayloadType

This removes one more place where we were unable to handle codecs not
in the built-in set.

BUG=webrtc:5805

Review-Url: https://codereview.webrtc.org/2686043006
Cr-Commit-Position: refs/heads/master@{#17370}
diff --git a/webrtc/modules/audio_coding/acm2/acm_receiver.cc b/webrtc/modules/audio_coding/acm2/acm_receiver.cc
index 21dbc74..4980d27 100644
--- a/webrtc/modules/audio_coding/acm2/acm_receiver.cc
+++ b/webrtc/modules/audio_coding/acm2/acm_receiver.cc
@@ -179,6 +179,10 @@
   return 0;
 }
 
+void AcmReceiver::SetCodecs(const std::map<int, SdpAudioFormat>& codecs) {
+  neteq_->SetCodecs(codecs);
+}
+
 int32_t AcmReceiver::AddCodec(int acm_codec_id,
                               uint8_t payload_type,
                               size_t channels,