Remove FixRate congestion frame type.

net/quic/congestion_control/fix_rate_receiver.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/fix_rate_receiver.h"
-
-#include "base/basictypes.h"
-#include "net/quic/congestion_control/receive_algorithm_interface.h"
-
-namespace {
-  static const int kInitialBitrate = 100000;  // In bytes per second.
-}
-
-namespace net {
-
-FixRateReceiver::FixRateReceiver()
-    : configured_rate_(QuicBandwidth::FromBytesPerSecond(kInitialBitrate)) {
-}
-
-bool FixRateReceiver::GenerateCongestionFeedback(
-    QuicCongestionFeedbackFrame* feedback) {
-  feedback->type = kFixRate;
-  feedback->fix_rate.bitrate = configured_rate_;
-  return true;
-}
-
-void FixRateReceiver::RecordIncomingPacket(
-    QuicByteCount /*bytes*/,
-    QuicPacketSequenceNumber /*sequence_number*/,
-    QuicTime /*timestamp*/) {
-  // Nothing to do for this simple implementation.
-}
-
-}  // namespace net