Refactor NACK bitrate allocation

webrtc/video/video_send_stream.cc

Index: webrtc/video/video_send_stream.cc
diff --git a/webrtc/video/video_send_stream.cc b/webrtc/video/video_send_stream.cc
index 01c2fc836c7d4a35dde12d1a13b4cd2fbb8e5cf0..55e2abe874ac0b710a734b01b8910b353ab8e1ff 100644
--- a/webrtc/video/video_send_stream.cc
+++ b/webrtc/video/video_send_stream.cc
@@ -52,6 +52,7 @@ std::vector<RtpRtcp*> CreateRtpRtcpModules(
     SendStatisticsProxy* stats_proxy,
     SendDelayStats* send_delay_stats,
     RtcEventLog* event_log,
+    NackRateLimiter* nack_rate_limiter,
     size_t num_modules) {
   RTC_DCHECK_GT(num_modules, 0u);
   RtpRtcp::Configuration configuration;
@@ -73,6 +74,7 @@ std::vector<RtpRtcp*> CreateRtpRtcpModules(
   configuration.send_side_delay_observer = stats_proxy;
   configuration.send_packet_observer = send_delay_stats;
   configuration.event_log = event_log;
+  configuration.nack_rate_limiter = nack_rate_limiter;
 
   std::vector<RtpRtcp*> modules;
   for (size_t i = 0; i < num_modules; ++i) {
@@ -426,6 +428,7 @@ VideoSendStream::VideoSendStream(
           &stats_proxy_,
           send_delay_stats,
           event_log,
+          congestion_controller_->GetNackRateLimiter(),
           config_.rtp.ssrcs.size())),
       payload_router_(rtp_rtcp_modules_, config.encoder_settings.payload_type),
       input_(&encoder_wakeup_event_,