Deprecate rolled out flag: FLAGS_quic_allow_port_migration.

net/quic/quic_flags.cc

 // Copyright 2014 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_flags.h"
 
 // TODO(rtenneti): Remove this.
 // Do not flip this flag until the flakiness of the
 // net/tools/quic/end_to_end_test is fixed.
 // If true, then QUIC connections will track the retransmission history of a
 // packet so that an ack of a previous transmission will ack the data of all
 // other transmissions.
 bool FLAGS_track_retransmission_history = false;
 
 // Do not remove this flag until the Finch-trials described in b/11706275
 // are complete.
 // If true, QUIC connections will support the use of a pacing algorithm when
 // sending packets, in an attempt to reduce packet loss.  The client must also
 // request pacing for the server to enable it.
 bool FLAGS_enable_quic_pacing = true;
 
 bool FLAGS_quic_allow_oversized_packets_for_test = false;
 
 // When true, the use time based loss detection instead of nack.
 bool FLAGS_quic_use_time_loss_detection = false;
 
-// If true, allow peer port migration of established QUIC connections.
-bool FLAGS_quic_allow_port_migration = true;
-
 // If true, it will return as soon as an error is detected while validating
 // CHLO.
 bool FLAGS_use_early_return_when_verifying_chlo = true;
 
 // If true, QUIC crypto reject message will include the reasons for rejection.
 bool FLAGS_send_quic_crypto_reject_reason = false;
 
 // If true, QUIC connections will support FEC protection of data while sending
 // packets, to reduce latency of data delivery to the application. The client
 // must also request FEC protection for the server to use FEC.
 bool FLAGS_enable_quic_fec = false;
 
 // If true, a QUIC connection with too many unfinished streams will be closed.
 bool FLAGS_close_quic_connection_unfinished_streams = false;