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

webrtc/api/rtpparameters.h

Index: webrtc/api/rtpparameters.h
diff --git a/webrtc/api/rtpparameters.h b/webrtc/api/rtpparameters.h
index e71a1aebbaf23bbaa589759112b762916b7d25c0..2557a21b23e100f16063883064cfdd389b3c7283 100644
--- a/webrtc/api/rtpparameters.h
+++ b/webrtc/api/rtpparameters.h
@@ -12,13 +12,14 @@
 #define WEBRTC_API_RTPPARAMETERS_H_
 
 #include <vector>
+#include "webrtc/base/optional.h"
 
 namespace webrtc {
 
 // These structures are defined as part of the RtpSender interface.
 // See http://w3c.github.io/webrtc-pc/#rtcrtpsender-interface for details.
 struct RtpEncodingParameters {
-  int max_bitrate_bps = -1;
+  rtc::Optional<int> max_bitrate_bps;
 };
 
 struct RtpParameters {