First step to remove SingleRequestHostResolver.

net/proxy/proxy_script_decider.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_PROXY_PROXY_SCRIPT_DECIDER_H_
 #define NET_PROXY_PROXY_SCRIPT_DECIDER_H_
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "net/base/address_list.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/dns/host_resolver.h"
-#include "net/dns/single_request_host_resolver.h"
 #include "net/log/net_log.h"
 #include "net/proxy/proxy_config.h"
 #include "net/proxy/proxy_resolver.h"
 #include "url/gurl.h"
 
 namespace net {
 
 class DhcpProxyScriptFetcher;
 class NetLogParameter;
 class ProxyResolver;
@@ skipping 159 matching lines @@
 
   // Whether to do DNS quick check
   bool quick_check_enabled_;
 
   // Results.
   ProxyConfig effective_config_;
   scoped_refptr<ProxyResolverScriptData> script_data_;
 
   AddressList wpad_addresses_;
   base::OneShotTimer quick_check_timer_;
-  std::unique_ptr<SingleRequestHostResolver> host_resolver_;
+  HostResolver* host_resolver_;
+  std::unique_ptr<HostResolver::Request> request_;
   base::Time quick_check_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyScriptDecider);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_SCRIPT_DECIDER_H_