net: remove UsingTCPFastOpen() method from StreamSocket class

net/socket/tcp_client_socket.cc

 // 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.
 
 #include "net/socket/tcp_client_socket.h"
 
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "base/logging.h"
@@ skipping 221 matching lines @@
 }
 
 void TCPClientSocket::SetOmniboxSpeculation() {
   use_history_.set_omnibox_speculation();
 }
 
 bool TCPClientSocket::WasEverUsed() const {
   return use_history_.was_used_to_convey_data();
 }
 
-bool TCPClientSocket::UsingTCPFastOpen() const {
-  return socket_->UsingTCPFastOpen();
-}
-
 void TCPClientSocket::EnableTCPFastOpenIfSupported() {
   socket_->EnableTCPFastOpenIfSupported();
 }
 
 bool TCPClientSocket::WasNpnNegotiated() const {
   return false;
 }
 
 NextProto TCPClientSocket::GetNegotiatedProtocol() const {
   return kProtoUnknown;
@@ skipping 123 matching lines @@
 void TCPClientSocket::EmitTCPMetricsHistogramsOnDisconnect() {
   base::TimeDelta rtt;
   if (socket_->GetEstimatedRoundTripTime(&rtt)) {
     UMA_HISTOGRAM_CUSTOM_TIMES("Net.TcpRtt.AtDisconnect", rtt,
                                base::TimeDelta::FromMilliseconds(1),
                                base::TimeDelta::FromMinutes(10), 100);
   }
 }
 
 }  // namespace net