Change QUIC's PrrSender::TimeUntilSend to accept bytes instead of packets.

net/quic/congestion_control/prr_sender.h

 // Copyright (c) 2014 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.
 //
 // Implements Proportional Rate Reduction (PRR) per RFC 6937.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_PRR_SENDER_H_
 #define NET_QUIC_CONGESTION_CONTROL_PRR_SENDER_H_
 
 #include "net/quic/quic_bandwidth.h"
 #include "net/quic/quic_time.h"
 
 namespace net {
 
 class NET_EXPORT_PRIVATE PrrSender {
  public:
   PrrSender();
   // OnPacketLost should be called on the first loss that triggers a recovery
   // period and all other methods in this class should only be called when in
   // recovery.
   void OnPacketLost(QuicByteCount bytes_in_flight);
   void OnPacketSent(QuicByteCount sent_bytes);
   void OnPacketAcked(QuicByteCount acked_bytes);
   QuicTime::Delta TimeUntilSend(QuicByteCount congestion_window,
                                 QuicByteCount bytes_in_flight,
-                                QuicPacketCount slowstart_threshold)
-      const;
+                                QuicByteCount slowstart_threshold) const;
 
  private:
   // Bytes sent and acked since the last loss event.
   // |bytes_sent_since_loss_| is the same as "prr_out_" in RFC 6937,
   // and |bytes_delivered_since_loss_| is the same as "prr_delivered_".
   QuicByteCount bytes_sent_since_loss_;
   QuicByteCount bytes_delivered_since_loss_;
   size_t ack_count_since_loss_;
 
   // The congestion window before the last loss event.
   QuicByteCount bytes_in_flight_before_loss_;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_PRR_SENDER_H_