Remove multipath_enabled from quic_config and quic_connection. No functional change expected.

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 241 matching lines @@
       perspective_(perspective),
       connected_(true),
       can_truncate_connection_ids_(true),
       mtu_discovery_target_(0),
       mtu_probe_count_(0),
       packets_between_mtu_probes_(kPacketsBetweenMtuProbesBase),
       next_mtu_probe_at_(kPacketsBetweenMtuProbesBase),
       largest_received_packet_size_(0),
       goaway_sent_(false),
       goaway_received_(false),
-      multipath_enabled_(false),
       write_error_occured_(false),
       no_stop_waiting_frames_(false) {
   QUIC_DLOG(INFO) << ENDPOINT
                   << "Created connection with connection_id: " << connection_id;
   framer_.set_visitor(this);
   stats_.connection_creation_time = clock_->ApproximateNow();
   // TODO(ianswett): Supply the NetworkChangeVisitor as a constructor argument
   // and make it required non-null, because it's always used.
   sent_packet_manager_.SetNetworkChangeVisitor(this);
   // Allow the packet writer to potentially reduce the packet size to a value
@@ skipping 27 matching lines @@
 
 void QuicConnection::SetFromConfig(const QuicConfig& config) {
   if (config.negotiated()) {
     // Handshake complete, set handshake timeout to Infinite.
     SetNetworkTimeouts(QuicTime::Delta::Infinite(),
                        config.IdleNetworkTimeout());
     if (config.SilentClose()) {
       idle_timeout_connection_close_behavior_ =
           ConnectionCloseBehavior::SILENT_CLOSE;
     }
-    if (FLAGS_quic_reloadable_flag_quic_enable_multipath &&
-        config.MultipathEnabled()) {
-      multipath_enabled_ = true;
-    }
   } else {
     SetNetworkTimeouts(config.max_time_before_crypto_handshake(),
                        config.max_idle_time_before_crypto_handshake());
   }
 
   sent_packet_manager_.SetFromConfig(config);
   if (config.HasReceivedBytesForConnectionId() &&
       can_truncate_connection_ids_) {
     packet_generator_.SetConnectionIdLength(
         config.ReceivedBytesForConnectionId());
@@ skipping 983 matching lines @@
   if (!Near(header.packet_number, last_header_.packet_number)) {
     QUIC_DLOG(INFO) << ENDPOINT << "Packet " << header.packet_number
                     << " out of bounds.  Discarding";
     CloseConnection(QUIC_INVALID_PACKET_HEADER, "Packet number out of bounds.",
                     ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return false;
   }
 
   // Multipath is not enabled, but a packet with multipath flag on is
   // received.
-  if (!multipath_enabled_ && header.public_header.multipath_flag) {
+  if (header.public_header.multipath_flag) {
     const string error_details =
         "Received a packet with multipath flag but multipath is not enabled.";
     QUIC_BUG << error_details;
     CloseConnection(QUIC_BAD_MULTIPATH_FLAG, error_details,
                     ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return false;
   }
 
   if (version_negotiation_state_ != NEGOTIATED_VERSION) {
     if (perspective_ == Perspective::IS_SERVER) {
@@ skipping 1073 matching lines @@
 
 void QuicConnection::CheckIfApplicationLimited() {
   if (queued_packets_.empty() &&
       !sent_packet_manager_.HasPendingRetransmissions() &&
       !visitor_->WillingAndAbleToWrite()) {
     sent_packet_manager_.OnApplicationLimited();
   }
 }
 
 }  // namespace net