Remove the flag which disables non NAT address 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"
 
 // When true, the use time based loss detection instead of nack.
 bool FLAGS_quic_use_time_loss_detection = false;
 
 // If true, it will return as soon as an error is detected while validating
@@ skipping 56 matching lines @@
 // Net.QuicSession.HeadersHOLBlockedTime.
 bool FLAGS_quic_measure_headers_hol_blocking_time = true;
 
 // Disable QUIC's userspace pacing.
 bool FLAGS_quic_disable_pacing = false;
 
 // If true, Use QUIC's GeneralLossAlgorithm implementation instead of
 // TcpLossAlgorithm or TimeLossAlgorithm.
 bool FLAGS_quic_general_loss_algorithm = true;
 
-// If true, only migrate QUIC connections when client address changes are
-// considered to be caused by NATs.
-bool FLAGS_quic_disable_non_nat_address_migration = true;
-
 // If true, QUIC connections will timeout when packets are not being recieved,
 // even if they are being sent.
 bool FLAGS_quic_use_new_idle_timeout = true;
 
 // If true, replace QuicFrameList with StreamSequencerBuffer as underlying data
 // structure for QuicStreamSequencer bufferring.
 bool FLAGS_quic_use_stream_sequencer_buffer = true;
 
 // If true, don't send QUIC packets if the send alarm is set.
 bool FLAGS_quic_respect_send_alarm2 = true;
@@ skipping 74 matching lines @@
 // priority (or batch) streams when doing QUIC writes.
 bool FLAGS_quic_cede_correctly = true;
 
 // Has QuicCryptoProof hold a ref to the primary_config instead of storing its
 // SCID.
 bool FLAGS_quic_crypto_proof_use_ref = true;
 
 // If on, max number of incoming and outgoing streams will be different.
 // Incoming will be a little higher than outgoing to tolerate race condition.
 bool FLAGS_quic_different_max_num_open_streams = true;