First step to remove SingleRequestHostResolver.

net/ftp/ftp_network_transaction.cc

 // 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.
 
 #include "net/ftp/ftp_network_transaction.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 619 matching lines @@
     }
   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
   return rv;
 }
 
 int FtpNetworkTransaction::DoCtrlResolveHost() {
   next_state_ = STATE_CTRL_RESOLVE_HOST_COMPLETE;
 
   HostResolver::RequestInfo info(HostPortPair::FromURL(request_->url));
   // No known referrer.
-  return resolver_.Resolve(
-      info,
-      DEFAULT_PRIORITY,
-      &addresses_,
+  return resolver_->Resolve(
+      info, DEFAULT_PRIORITY, &addresses_,
       base::Bind(&FtpNetworkTransaction::OnIOComplete, base::Unretained(this)),
-      net_log_);
+      &resolve_request_, net_log_);
 }
 
 int FtpNetworkTransaction::DoCtrlResolveHostComplete(int result) {
   if (result == OK)
     next_state_ = STATE_CTRL_CONNECT;
   return result;
 }
 
 int FtpNetworkTransaction::DoCtrlConnect() {
   next_state_ = STATE_CTRL_CONNECT_COMPLETE;
@@ skipping 716 matching lines @@
   if (!had_error_type[type]) {
     had_error_type[type] = true;
     UMA_HISTOGRAM_ENUMERATION("Net.FtpDataConnectionErrorHappened",
         type, NUM_OF_NET_ERROR_TYPES);
   }
   UMA_HISTOGRAM_ENUMERATION("Net.FtpDataConnectionErrorCount",
       type, NUM_OF_NET_ERROR_TYPES);
 }
 
 }  // namespace net