Update from https://crrev.com/302630

net/quic/congestion_control/tcp_cubic_sender.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // TCP cubic send side congestion algorithm, emulates the behavior of
 // TCP cubic.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_
 #define NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_
 
@@ skipping 52 matching lines @@
   QuicByteCount GetCongestionWindow() const override;
   bool InSlowStart() const override;
   bool InRecovery() const override;
   QuicByteCount GetSlowStartThreshold() const override;
   CongestionControlType GetCongestionControlType() const override;
   // End implementation of SendAlgorithmInterface.
 
  private:
   friend class test::TcpCubicSenderPeer;
 
+  // Compute the TCP Reno beta based on the current number of connections.
+  float RenoBeta() const;
+
   // TODO(ianswett): Remove these and migrate to OnCongestionEvent.
   void OnPacketAcked(QuicPacketSequenceNumber acked_sequence_number,
                      QuicByteCount acked_bytes,
                      QuicByteCount bytes_in_flight);
   void OnPacketLost(QuicPacketSequenceNumber largest_loss,
                     QuicByteCount bytes_in_flight);
 
   void MaybeIncreaseCwnd(QuicPacketSequenceNumber acked_sequence_number,
                          QuicByteCount bytes_in_flight);
   bool IsCwndLimited(QuicByteCount bytes_in_flight) const;
@@ skipping 40 matching lines @@
 
   // Maximum number of outstanding packets for tcp.
   QuicPacketCount max_tcp_congestion_window_;
 
   DISALLOW_COPY_AND_ASSIGN(TcpCubicSender);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_