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/rtp_rtcp/include/rtp_payload_registry.h

@@ -15,6 +15,7 @@
 #include <memory>
 #include <set>
 
+#include "webrtc/api/audio_codecs/audio_format.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/deprecation.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.h"
@@ -43,6 +44,10 @@ class RTPPayloadRegistry {
 
   // TODO(magjed): Split RTPPayloadRegistry into separate Audio and Video class
   // and simplify the code. http://crbug/webrtc/6743.
+
+  // Replace all audio receive payload types with the given map.
+  void SetAudioReceivePayloads(std::map<int, SdpAudioFormat> codecs);
+
   int32_t RegisterReceivePayload(const CodecInst& audio_codec,
                                  bool* created_new_payload_type);
   int32_t RegisterReceivePayload(const VideoCodec& video_codec);