Remove FixRate congestion frame type.

net/quic/congestion_control/send_algorithm_interface.cc

 // 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.
 
 #include "net/quic/congestion_control/send_algorithm_interface.h"
 
-#include "net/quic/congestion_control/fix_rate_sender.h"
 #include "net/quic/congestion_control/tcp_cubic_sender.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 
 class RttStats;
 
 // Factory for send side congestion control algorithm.
 SendAlgorithmInterface* SendAlgorithmInterface::Create(
     const QuicClock* clock,
     const RttStats* rtt_stats,
     CongestionControlType congestion_control_type,
     QuicConnectionStats* stats) {
   switch (congestion_control_type) {
     case kCubic:
       return new TcpCubicSender(clock, rtt_stats,
                                 false /* don't use Reno */,
                                 kMaxTcpCongestionWindow, stats);
     case kReno:
       return new TcpCubicSender(clock, rtt_stats,
                                 true /* use Reno */,
                                 kMaxTcpCongestionWindow, stats);
-    case kFixRateCongestionControl:
-      return new FixRateSender(rtt_stats);
     case kBBR:
       LOG(DFATAL) << "BbrTcpSender is not supported.";
       return NULL;
   }
   return NULL;
 }
 
 }  // namespace net