Deprecate FLAGS_quic_limit_cubic_cwnd_increase.

net/quic/core/congestion_control/cubic_bytes.cc

 // Copyright (c) 2015 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_bytes.h"
 
 #include <stdint.h>
 #include <algorithm>
 #include <cmath>
 
@@ skipping 134 matching lines @@
       ((current_time + delay_min - epoch_).ToMicroseconds() << 10) /
       kNumMicrosPerSecond;
 
   int64_t offset = time_to_origin_point_ - elapsed_time;
   QuicByteCount delta_congestion_window =
       ((kCubeCongestionWindowScale * offset * offset * offset) >> kCubeScale) *
       kDefaultTCPMSS;
 
   QuicByteCount 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 bytes.
-    target_congestion_window =
-        min(target_congestion_window,
-            current_congestion_window + acked_bytes_count_ / 2);
-  }
+  // Limit the CWND increase to half the acked bytes.
+  target_congestion_window =
+      min(target_congestion_window,
+          current_congestion_window + acked_bytes_count_ / 2);
 
   DCHECK_LT(0u, estimated_tcp_congestion_window_);
   // Increase the window by Alpha * 1 MSS of bytes every time we ack an
   // estimated tcp window of bytes.
   estimated_tcp_congestion_window_ += acked_bytes_count_ *
                                       (Alpha() * kDefaultTCPMSS) /
                                       estimated_tcp_congestion_window_;
   acked_bytes_count_ = 0;
 
   // We have a new cubic congestion window.
   last_target_congestion_window_ = target_congestion_window;
 
   // Compute target congestion_window based on cubic target and estimated TCP
   // 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