Remove the using_pacing argument from QuicSentPacketManager::SetFromConfig because it's always true.

net/quic/congestion_control/tcp_cubic_sender.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/tcp_cubic_sender.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram.h"
 #include "net/quic/congestion_control/prr_sender.h"
@@ skipping 31 matching lines @@
       congestion_window_count_(0),
       largest_sent_sequence_number_(0),
       largest_acked_sequence_number_(0),
       largest_sent_at_last_cutback_(0),
       congestion_window_(initial_tcp_congestion_window),
       min_congestion_window_(kDefaultMinimumCongestionWindow),
       slowstart_threshold_(max_tcp_congestion_window),
       last_cutback_exited_slowstart_(false),
       max_tcp_congestion_window_(max_tcp_congestion_window),
       clock_(clock) {
+  // Disable the ack train mode in hystart when pacing is enabled, since it
+  // may be falsely triggered.
+  hybrid_slow_start_.set_ack_train_detection(false);
 }
 
 TcpCubicSender::~TcpCubicSender() {
   UMA_HISTOGRAM_COUNTS("Net.QuicSession.FinalTcpCwnd", congestion_window_);
 }
 
 void TcpCubicSender::SetFromConfig(const QuicConfig& config,
-                                   Perspective perspective,
-                                   bool using_pacing) {
+                                   Perspective perspective) {
   if (perspective == Perspective::IS_SERVER) {
     if (config.HasReceivedConnectionOptions() &&
         ContainsQuicTag(config.ReceivedConnectionOptions(), kIW10)) {
       // Initial window experiment.
       congestion_window_ = 10;
     }
     if (config.HasReceivedConnectionOptions() &&
         ContainsQuicTag(config.ReceivedConnectionOptions(), kMIN1)) {
       // Min CWND experiment.
       min_congestion_window_ = 1;
     }
-    if (using_pacing) {
-      // Disable the ack train mode in hystart when pacing is enabled, since it
-      // may be falsely triggered.
-      hybrid_slow_start_.set_ack_train_detection(false);
-    }
   }
 }
 
 bool TcpCubicSender::ResumeConnectionState(
     const CachedNetworkParameters& cached_network_params,
     bool max_bandwidth_resumption) {
   // If the previous bandwidth estimate is less than an hour old, store in
   // preparation for doing bandwidth resumption.
   int64 seconds_since_estimate =
       clock_->WallNow().ToUNIXSeconds() - cached_network_params.timestamp();
@@ skipping 277 matching lines @@
   hybrid_slow_start_.Restart();
   slowstart_threshold_ = congestion_window_ / 2;
   congestion_window_ = min_congestion_window_;
 }
 
 CongestionControlType TcpCubicSender::GetCongestionControlType() const {
   return reno_ ? kReno : kCubic;
 }
 
 }  // namespace net