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 25ba2c0586ccf1020e0ad4bf03743e28721c9f4d..51732378e200a8a55397938c5b812be3dae2304a 100644
--- a/webrtc/pc/channel.cc
+++ b/webrtc/pc/channel.cc
@@ -139,7 +139,7 @@ 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,