First step to remove SingleRequestHostResolver.

net/ftp/ftp_network_transaction.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_FTP_FTP_NETWORK_TRANSACTION_H_
 #define NET_FTP_FTP_NETWORK_TRANSACTION_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/address_list.h"
 #include "net/base/auth.h"
 #include "net/dns/host_resolver.h"
-#include "net/dns/single_request_host_resolver.h"
 #include "net/ftp/ftp_ctrl_response_buffer.h"
 #include "net/ftp/ftp_response_info.h"
 #include "net/ftp/ftp_transaction.h"
 #include "net/log/net_log.h"
 
 namespace net {
 
 class ClientSocketFactory;
 class StreamSocket;
 
@@ skipping 169 matching lines @@
   Command command_sent_;
 
   CompletionCallback io_callback_;
   CompletionCallback user_callback_;
 
   BoundNetLog net_log_;
   const FtpRequestInfo* request_;
   FtpResponseInfo response_;
 
   // Cancels the outstanding request on destruction.
-  SingleRequestHostResolver resolver_;
+  HostResolver* resolver_;
   AddressList addresses_;
+  std::unique_ptr<HostResolver::Request> resolve_request_;
 
   // User buffer passed to the Read method for control socket.
   scoped_refptr<IOBuffer> read_ctrl_buf_;
 
   std::unique_ptr<FtpCtrlResponseBuffer> ctrl_response_buffer_;
 
   scoped_refptr<IOBuffer> read_data_buf_;
   int read_data_buf_len_;
 
   // Buffer holding the command line to be written to the control socket.
@@ skipping 32 matching lines @@
 
   State next_state_;
 
   // State to switch to after data connection is complete.
   State state_after_data_connect_complete_;
 };
 
 }  // namespace net
 
 #endif  // NET_FTP_FTP_NETWORK_TRANSACTION_H_