Updated structures and functions for setting the max bitrate limit to take rtc::Optional<int>

webrtc/pc/channel.cc

Index: webrtc/pc/channel.cc
diff --git a/webrtc/pc/channel.cc b/webrtc/pc/channel.cc
index d9aa8512aac0f29f50d685c27852224558b1031a..b928b6ce11e8dc463c9877a505fb7d6ddf8b5ee2 100644
--- a/webrtc/pc/channel.cc
+++ b/webrtc/pc/channel.cc
@@ -138,7 +138,7 @@ void RtpSendParametersFromMediaDescription(
     const MediaContentDescriptionImpl<Codec>* desc,
     RtpSendParameters<Codec>* send_params) {
   RtpParametersFromMediaDescription(desc, send_params);
-  send_params->max_bandwidth_bps = desc->bandwidth();
+  send_params->max_bitrate_bps = desc->bandwidth();
 }
 
 BaseChannel::BaseChannel(rtc::Thread* thread,