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}

webrtc/modules/audio_coding/neteq/neteq_impl.h

@@ -111,6 +111,8 @@ class NetEqImpl : public webrtc::NetEq {
 
   int GetAudio(AudioFrame* audio_frame, bool* muted) override;
 
+  void SetCodecs(const std::map<int, SdpAudioFormat>& codecs) override;
+
   int RegisterPayloadType(NetEqDecoder codec,
                           const std::string& codec_name,
                           uint8_t rtp_payload_type) override;