relnote: Deprecate FLAGS_quic_allow_ip_migration.

net/quic/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/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 1439 matching lines @@
   }
 }
 
 void QuicConnection::WriteIfNotBlocked() {
   if (!writer_->IsWriteBlocked()) {
     OnCanWrite();
   }
 }
 
 bool QuicConnection::ProcessValidatedPacket() {
-  if ((peer_ip_changed_ && !FLAGS_quic_allow_ip_migration) ||
-      self_ip_changed_ || self_port_changed_) {
-    SendConnectionCloseWithDetails(
-        QUIC_ERROR_MIGRATING_ADDRESS,
-        "Neither IP address migration, nor self port migration are supported.");
+  if (self_ip_changed_ || self_port_changed_) {
+    SendConnectionCloseWithDetails(QUIC_ERROR_MIGRATING_ADDRESS,
+                                   "Self address migration is not supported.");
     return false;
   }
 
   // TODO(fayang): Use peer_address_changed_ instead of peer_ip_changed_ and
   // peer_port_changed_ once FLAGS_quic_allow_ip_migration is deprecated.
   if (peer_ip_changed_ || peer_port_changed_) {
     IPEndPoint old_peer_address = peer_address_;
     peer_address_ = IPEndPoint(
         peer_ip_changed_ ? migrating_peer_ip_ : peer_address_.address(),
         peer_port_changed_ ? migrating_peer_port_ : peer_address_.port());
@@ skipping 931 matching lines @@
       packet_number_of_last_sent_packet_ + packets_between_mtu_probes_ + 1;
   ++mtu_probe_count_;
 
   DVLOG(2) << "Sending a path MTU discovery packet #" << mtu_probe_count_;
   SendMtuDiscoveryPacket(mtu_discovery_target_);
 
   DCHECK(!mtu_discovery_alarm_->IsSet());
 }
 
 }  // namespace net