Refactor NACK bitrate allocation

webrtc/modules/rtp_rtcp/include/rtp_rtcp.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
index 7c72e5917c8ab2feb8acdac1c119cd3e25b8b5c6..bfd8e657432b2dc6197e9aab0d7f130a47d8f232 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
@@ -23,11 +23,12 @@
 
 namespace webrtc {
 // Forward declarations.
+class RateLimiter;
 class ReceiveStatistics;
 class RemoteBitrateEstimator;
+class RtcEventLog;
 class RtpReceiver;
 class Transport;
-class RtcEventLog;
 
 RTPExtensionType StringToRtpExtensionType(const std::string& extension);
 
@@ -79,6 +80,7 @@ class RtpRtcp : public Module {
     SendSideDelayObserver* send_side_delay_observer;
     RtcEventLog* event_log;
     SendPacketObserver* send_packet_observer;
+    RateLimiter* retransmission_rate_limiter;
     RTC_DISALLOW_COPY_AND_ASSIGN(Configuration);
   };
 
@@ -616,11 +618,6 @@ class RtpRtcp : public Module {
     ***************************************************************************/
 
     /*
-    *   Set the target send bitrate
-    */
-    virtual void SetTargetSendBitrate(uint32_t bitrate_bps) = 0;
-
-    /*
     *   Turn on/off generic FEC
     */
     virtual void SetGenericFECStatus(bool enable,