Avoid doing concurrent DNS resolves of the same hostname

net/ftp/ftp_network_transaction.cc

 // Copyright (c) 2008 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/ftp/ftp_network_transaction.h"
 
 #include "base/compiler_specific.h"
 #include "base/string_util.h"
 #include "net/base/client_socket.h"
 #include "net/base/client_socket_factory.h"
@@ skipping 16 matching lines @@
 
 FtpNetworkTransaction::FtpNetworkTransaction(
     FtpNetworkSession* session,
     ClientSocketFactory* socket_factory)
     : command_sent_(COMMAND_NONE),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           io_callback_(this, &FtpNetworkTransaction::OnIOComplete)),
       user_callback_(NULL),
       session_(session),
       request_(NULL),
+      resolver_(session->host_resolver()),
       read_ctrl_buf_size_(kCtrlBufLen),
       response_message_buf_len_(0),
       read_data_buf_len_(0),
       file_data_len_(0),
       last_error_(OK),
       is_anonymous_(false),
       retr_failed_(false),
       data_connection_port_(0),
       socket_factory_(socket_factory),
       next_state_(STATE_NONE) {
@@ skipping 824 matching lines @@
                             &io_callback_);
 }
 
 int FtpNetworkTransaction::DoDataReadComplete(int result) {
   DLOG(INFO) << read_data_buf_->data();  // The read_data_buf_ is NULL
                                          // terminated string.
   return result;
 }
 
 }  // namespace net