Deprecate FLAGS_quic_limit_cubic_cwnd_increase.

net/quic/core/congestion_control/cubic.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/core/congestion_control/cubic.h"
 
 #include <stdint.h>
 #include <algorithm>
 #include <cmath>
 
@@ skipping 132 matching lines @@
       ((current_time + delay_min - epoch_).ToMicroseconds() << 10) /
       kNumMicrosPerSecond;
 
   int64_t offset = time_to_origin_point_ - elapsed_time;
   QuicPacketCount delta_congestion_window =
       (kCubeCongestionWindowScale * offset * offset * offset) >> kCubeScale;
 
   QuicPacketCount target_congestion_window =
       origin_point_congestion_window_ - delta_congestion_window;
 
-  if (FLAGS_quic_limit_cubic_cwnd_increase) {
-    // Limit the CWND increase to half the acked packets rounded up to the
-    // nearest packet.
-    target_congestion_window =
-        min(target_congestion_window,
-            current_congestion_window + (epoch_packets_count_ + 1) / 2);
-  }
+  // Limit the CWND increase to half the acked packets rounded up to the
+  // nearest packet.
+  target_congestion_window =
+      min(target_congestion_window,
+          current_congestion_window + (epoch_packets_count_ + 1) / 2);
 
   DCHECK_LT(0u, estimated_tcp_congestion_window_);
   // With dynamic beta/alpha based on number of active streams, it is possible
   // for the required_ack_count to become much lower than acked_packets_count_
   // suddenly, leading to more than one iteration through the following loop.
   while (true) {
     // Update estimated TCP congestion_window.
     QuicPacketCount required_ack_count = static_cast<QuicPacketCount>(
         estimated_tcp_congestion_window_ / Alpha());
     if (acked_packets_count_ < required_ack_count) {
@@ skipping 11 matching lines @@
   // congestion_window, use highest (fastest).
   if (target_congestion_window < estimated_tcp_congestion_window_) {
     target_congestion_window = estimated_tcp_congestion_window_;
   }
 
   DVLOG(1) << "Final target congestion_window: " << target_congestion_window;
   return target_congestion_window;
 }
 
 }  // namespace net