Reland of actor NACK bitrate allocation

webrtc/video/payload_router.h

Index: webrtc/video/payload_router.h
diff --git a/webrtc/video/payload_router.h b/webrtc/video/payload_router.h
index ce65bae6f81d150c8110a072b414e24e5e7eed77..9c66bd0d15b105bfc52134036d7ec9fffad1cfcd 100644
--- a/webrtc/video/payload_router.h
+++ b/webrtc/video/payload_router.h
@@ -50,9 +50,6 @@
                   const CodecSpecificInfo* codec_specific_info,
                   const RTPFragmentationHeader* fragmentation) override;
 
-  // Configures current target bitrate.
-  void SetTargetSendBitrate(uint32_t bitrate_bps);
-
   // Returns the maximum allowed data payload length, given the configured MTU
   // and RTP headers.
   size_t MaxPayloadLength() const;