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

net/quic/core/quic_config.h

 // Copyright (c) 2013 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.
 
 #ifndef NET_QUIC_CORE_QUIC_CONFIG_H_
 #define NET_QUIC_CORE_QUIC_CONFIG_H_
 
 #include <cstddef>
 #include <cstdint>
 #include <string>
@@ skipping 333 matching lines @@
 
   uint32_t ReceivedInitialSessionFlowControlWindowBytes() const;
 
   // Sets socket receive buffer to transmit to the peer.
   void SetSocketReceiveBufferToSend(uint32_t window_bytes);
 
   bool HasReceivedSocketReceiveBuffer() const;
 
   uint32_t ReceivedSocketReceiveBuffer() const;
 
-  void SetMultipathEnabled(bool multipath_enabled);
-
-  bool MultipathEnabled() const;
-
   void SetDisableConnectionMigration();
 
   bool DisableConnectionMigration() const;
 
   void SetAlternateServerAddressToSend(
       const QuicSocketAddress& alternate_server_address);
 
   bool HasReceivedAlternateServerAddress() const;
 
   const QuicSocketAddress& ReceivedAlternateServerAddress() const;
@@ skipping 53 matching lines @@
 
   // Initial stream flow control receive window in bytes.
   QuicFixedUint32 initial_stream_flow_control_window_bytes_;
   // Initial session flow control receive window in bytes.
   QuicFixedUint32 initial_session_flow_control_window_bytes_;
 
   // Socket receive buffer in bytes.
   // TODO(ianswett): Deprecate once QUIC_VERSION_34 is deprecated.
   QuicFixedUint32 socket_receive_buffer_;
 
-  // Whether to support multipath for this connection.
-  QuicNegotiableUint32 multipath_enabled_;
-
   // Whether tell peer not to attempt connection migration.
   QuicFixedUint32 connection_migration_disabled_;
 
   // An alternate server address the client could connect to.
   QuicFixedSocketAddress alternate_server_address_;
 
   // Force HOL blocking for measurement purposes.
   QuicFixedUint32 force_hol_blocking_;
 
   // Whether support HTTP/2 SETTINGS_MAX_HEADER_LIST_SIZE SETTINGS frame.
   QuicFixedUint32 support_max_header_list_size_;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_CONFIG_H_