Remove the unused QUIC port selection logic.

net/http/http_network_session.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 91 matching lines @@
     // that of the origin.
     bool enable_http2_alternative_service_with_different_host;
     // Whether to enable QUIC Alt-Svc entries with hostname different than that
     // of the origin.
     bool enable_quic_alternative_service_with_different_host;
 
     // Enables QUIC support.
     bool enable_quic;
     // Disable QUIC if a connection times out with open streams.
     bool disable_quic_on_timeout_with_open_streams;
-    // Instruct QUIC to use consistent ephemeral ports when talking to
-    // the same server.
-    bool enable_quic_port_selection;
     // Disables QUIC's 0-RTT behavior.
     bool quic_always_require_handshake_confirmation;
     // Disables QUIC connection pooling.
     bool quic_disable_connection_pooling;
     // If not zero, the task to load QUIC server configs from the disk cache
     // will timeout after this value multiplied by the smoothed RTT for the
     // server.
     float quic_load_server_info_timeout_srtt_multiplier;
     // Causes QUIC to race reading the server config from disk with
     // sending an inchoate CHLO.
@@ skipping 189 matching lines @@
   NextProtoVector next_protos_;
 
   Params params_;
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_