No longer limit QUIC's max CWND to 200 packets. Protected by quic_dont_limit_max_cwnd.

net/quic/quic_sent_packet_manager.cc

 // Copyright 2013 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/quic_sent_packet_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 155 matching lines @@
   if (config.HasReceivedConnectionOptions() &&
       ContainsQuicTag(config.ReceivedConnectionOptions(), kTIME)) {
     loss_algorithm_.reset(LossDetectionInterface::Create(kTime));
   }
   if (config.HasReceivedSocketReceiveBuffer()) {
     receive_buffer_bytes_ =
         max(kMinSocketReceiveBuffer,
             static_cast<QuicByteCount>(config.ReceivedSocketReceiveBuffer()));
     QuicByteCount max_cwnd_bytes = static_cast<QuicByteCount>(
         receive_buffer_bytes_ * kConservativeReceiveBufferFraction);
-    max_cwnd_bytes = min(max_cwnd_bytes, kMaxCongestionWindow * kDefaultTCPMSS);
+    if (!FLAGS_quic_dont_limit_max_cwnd) {
+      // TODO(ianswett): Remove kMaxCongestionWindow once deprecated.
+      max_cwnd_bytes =
+          min(max_cwnd_bytes, kMaxCongestionWindow * kDefaultTCPMSS);
+    }
     send_algorithm_->SetMaxCongestionWindow(max_cwnd_bytes);
   }
   send_algorithm_->SetFromConfig(config, perspective_);
 
   if (network_change_visitor_ != nullptr) {
     network_change_visitor_->OnCongestionWindowChange();
   }
 }
 
 void QuicSentPacketManager::ResumeConnectionState(
@@ skipping 770 matching lines @@
 TransmissionInfo* QuicSentPacketManager::GetMutableTransmissionInfo(
     QuicPacketNumber packet_number) {
   return unacked_packets_.GetMutableTransmissionInfo(packet_number);
 }
 
 void QuicSentPacketManager::RemoveObsoletePackets() {
   unacked_packets_.RemoveObsoletePackets();
 }
 
 }  // namespace net