Deprecate FLAGS_quic_allow_server_address_change_for_mapped_ipv4.

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 1403 matching lines @@
     ScopedPacketBundler bundler(this, SEND_ACK_IF_QUEUED);
     OnCanWrite();
   }
 }
 
 bool QuicConnection::ProcessValidatedPacket(const QuicPacketHeader& header) {
   if (perspective_ == Perspective::IS_SERVER &&
       IsInitializedIPEndPoint(self_address_) &&
       IsInitializedIPEndPoint(last_packet_destination_address_) &&
       (!(self_address_ == last_packet_destination_address_))) {
-    if (!FLAGS_quic_allow_server_address_change_for_mapped_ipv4) {
-      CloseConnection(QUIC_ERROR_MIGRATING_ADDRESS,
-                      "Self address migration is not supported at the server.",
-                      ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
-      return false;
-    }
     // Allow change between pure IPv4 and equivalent mapped IPv4 address.
     IPAddress self_ip = self_address_.address();
     if (self_ip.IsIPv4MappedIPv6()) {
       self_ip = ConvertIPv4MappedIPv6ToIPv4(self_ip);
     }
     IPAddress last_packet_destination_ip =
         last_packet_destination_address_.address();
     if (last_packet_destination_ip.IsIPv4MappedIPv6()) {
       last_packet_destination_ip =
           ConvertIPv4MappedIPv6ToIPv4(last_packet_destination_ip);
@@ skipping 1150 matching lines @@
 
 void QuicConnection::CheckIfApplicationLimited() {
   if (queued_packets_.empty() &&
       !sent_packet_manager_->HasPendingRetransmissions() &&
       !visitor_->WillingAndAbleToWrite()) {
     sent_packet_manager_->OnApplicationLimited();
   }
 }
 
 }  // namespace net