Revert of WebRtcVoiceMediaChannel::AddRecvStream: Don't call SetRecPayloadType (patchset #13 id:260001 of https://codereview.webrtc.org/2686043006/ )

Reason for revert:
Makes perf and Chromium FYI bots unhappy.

Original issue's description:
> 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}
> Committed: 1724cfbdba

TBR=ossu@webrtc.org,solenberg@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5805

Review-Url: https://codereview.webrtc.org/2772043002
Cr-Commit-Position: refs/heads/master@{#17374}

webrtc/modules/audio_coding/neteq/decoder_database.h

@@ -149,11 +149,6 @@ class DecoderDatabase {
   // using InsertExternal().
   virtual void Reset();
 
-  // Replaces the existing set of decoders with the given set. Returns the
-  // payload types that were reassigned or removed while doing so.
-  virtual std::vector<int> SetCodecs(
-      const std::map<int, SdpAudioFormat>& codecs);
-
   // Registers |rtp_payload_type| as a decoder of type |codec_type|. The |name|
   // is only used to populate the name field in the DecoderInfo struct in the
   // database, and can be arbitrary (including empty). Returns kOK on success;