First step to remove SingleRequestHostResolver.

net/socket/socks_client_socket.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/socket/socks_client_socket.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 83 matching lines @@
   if (rv == ERR_IO_PENDING) {
     user_callback_ = callback;
   } else {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SOCKS_CONNECT, rv);
   }
   return rv;
 }
 
 void SOCKSClientSocket::Disconnect() {
   completed_handshake_ = false;
-  host_resolver_.Cancel();
+  request_.reset();
   transport_->socket()->Disconnect();
 
   // Reset other states to make sure they aren't mistakenly used later.
   // These are the states initialized by Connect().
   next_state_ = STATE_NONE;
   user_callback_.Reset();
 }
 
 bool SOCKSClientSocket::IsConnected() const {
   return completed_handshake_ && transport_->socket()->IsConnected();
@@ skipping 167 matching lines @@
     }
   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
   return rv;
 }
 
 int SOCKSClientSocket::DoResolveHost() {
   next_state_ = STATE_RESOLVE_HOST_COMPLETE;
   // SOCKS4 only supports IPv4 addresses, so only try getting the IPv4
   // addresses for the target host.
   host_request_info_.set_address_family(ADDRESS_FAMILY_IPV4);
-  return host_resolver_.Resolve(
-      host_request_info_,
-      priority_,
-      &addresses_,
+  return host_resolver_->Resolve(
+      host_request_info_, priority_, &addresses_,
       base::Bind(&SOCKSClientSocket::OnIOComplete, base::Unretained(this)),
-      net_log_);
+      &request_, net_log_);
 }
 
 int SOCKSClientSocket::DoResolveHostComplete(int result) {
   if (result != OK) {
     // Resolving the hostname failed; fail the request rather than automatically
     // falling back to SOCKS4a (since it can be confusing to see invalid IP
     // addresses being sent to the SOCKS4 server when it doesn't support 4A.)
     return result;
   }
 
@@ skipping 138 matching lines @@
 
 int SOCKSClientSocket::GetPeerAddress(IPEndPoint* address) const {
   return transport_->socket()->GetPeerAddress(address);
 }
 
 int SOCKSClientSocket::GetLocalAddress(IPEndPoint* address) const {
   return transport_->socket()->GetLocalAddress(address);
 }
 
 }  // namespace net