deprecate FLAGS_graceful_emsgsize_on_mtu_probe

net/quic/core/quic_connection.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/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 1681 matching lines @@
     // duplicate packet being sent.  The helper must call OnCanWrite
     // when the write completes, and OnWriteError if an error occurs.
     if (!writer_->IsWriteBlockedDataBuffered()) {
       return false;
     }
   }
 
   if (FLAGS_quic_only_track_sent_packets) {
     // In some cases, an MTU probe can cause EMSGSIZE. This indicates that the
     // MTU discovery is permanently unsuccessful.
-    if (FLAGS_graceful_emsgsize_on_mtu_probe &&
-        result.status == WRITE_STATUS_ERROR &&
+    if (result.status == WRITE_STATUS_ERROR &&
         result.error_code == kMessageTooBigErrorCode &&
         packet->retransmittable_frames.empty() &&
         packet->encrypted_length > long_term_mtu_) {
       mtu_discovery_target_ = 0;
       mtu_discovery_alarm_->Cancel();
       // The write failed, but the writer is not blocked, so return true.
       return true;
     }
 
     if (result.status == WRITE_STATUS_ERROR) {
@@ skipping 48 matching lines @@
   stats_.bytes_sent += result.bytes_written;
   ++stats_.packets_sent;
   if (packet->transmission_type != NOT_RETRANSMISSION) {
     stats_.bytes_retransmitted += result.bytes_written;
     ++stats_.packets_retransmitted;
   }
 
   if (!FLAGS_quic_only_track_sent_packets) {
     // In some cases, an MTU probe can cause EMSGSIZE. This indicates that the
     // MTU discovery is permanently unsuccessful.
-    if (FLAGS_graceful_emsgsize_on_mtu_probe &&
-        result.status == WRITE_STATUS_ERROR &&
+    if (result.status == WRITE_STATUS_ERROR &&
         result.error_code == kMessageTooBigErrorCode &&
         packet->retransmittable_frames.empty() &&
         packet->encrypted_length > long_term_mtu_) {
       mtu_discovery_target_ = 0;
       mtu_discovery_alarm_->Cancel();
       return true;
     }
 
     if (result.status == WRITE_STATUS_ERROR) {
       OnWriteError(result.error_code);
@@ skipping 798 matching lines @@
 
 void QuicConnection::CheckIfApplicationLimited() {
   if (queued_packets_.empty() &&
       !sent_packet_manager_->HasPendingRetransmissions() &&
       !visitor_->WillingAndAbleToWrite()) {
     sent_packet_manager_->OnApplicationLimited();
   }
 }
 
 }  // namespace net