message: Allow AbsSendTime extension to be used for audio streams.
  Cr-Commit-Position: refs/heads/master@{#28655}
diff: @@ -155,6 +155,7 @@ constexpr int RtpExtension::kOneByteHeaderExtensionMaxValueSize;
  bool RtpExtension::IsSupportedForAudio(const std::string& uri) {
  return uri == webrtc::RtpExtension::kAudioLevelUri ||
  + uri == webrtc::RtpExtension::kAbsSendTimeUri ||
  // TODO(bugs.webrtc.org/10739): Uncomment once the audio impl is ready.
  // uri == webrtc::RtpExtension::kAbsoluteCaptureTimeUri ||
  uri == webrtc::RtpExtension::kTransportSequenceNumberUri ||
  