message: sdp: temporarily relax channel requirements for statically assigned payload types
  to allow for downstream users to upgrade.
  Cr-Commit-Position: refs/heads/main@{#37501}
diff: @@ -3636,10 +3636,10 @@ bool ParseRtpmapAttribute(absl::string_view line,
  AudioContentDescription* audio_desc = media_desc->as_audio();
  for (const cricket::AudioCodec& existing_codec : audio_desc->codecs()) {
  - // TODO(crbug.com/1338902) re-add check for clockrate.
  + // TODO(crbug.com/1338902) re-add checks for clockrate and number of
  + // channels.
  if (!existing_codec.name.empty() && payload_type == existing_codec.id &&
  - (!absl::EqualsIgnoreCase(encoding_name, existing_codec.name) ||
  - channels != existing_codec.channels)) {
  + (!absl::EqualsIgnoreCase(encoding_name, existing_codec.name))) {
  rtc::StringBuilder description;
  description
  << "Duplicate "
  