Remove FixRate congestion frame type.

net/quic/congestion_control/receive_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/receive_algorithm_interface.h"
 
-#include "net/quic/congestion_control/fix_rate_receiver.h"
 #include "net/quic/congestion_control/tcp_receiver.h"
 
 namespace net {
 
 // Factory for receive side congestion control algorithm.
 ReceiveAlgorithmInterface* ReceiveAlgorithmInterface::Create(
     CongestionFeedbackType type) {
   switch (type) {
     case kTCP:
       return new TcpReceiver();
     case kInterArrival:
       LOG(DFATAL) << "InterArrivalSendAlgorithm no longer supported.";
       return NULL;
-    case kFixRate:
-      return new FixRateReceiver();
   }
   return NULL;
 }
 
 }  // namespace net