net/dns: Fix the last warning found by chromium-style clang plugin on Windows.

net/dns/dns_config_service_win.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_DNS_DNS_CONFIG_SERVICE_WIN_H_
 #define NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
 
 // The sole purpose of dns_config_service_win.h is for unittests so we just
 // include these headers here.
 #include <winsock2.h>
@@ skipping 45 matching lines @@
     DWORD value;
   };
 
   struct DevolutionSetting {
     // UseDomainNameDevolution
     RegDword enabled;
     // DomainNameDevolutionLevel
     RegDword level;
   };
 
+  DnsSystemSettings();
+  ~DnsSystemSettings();
+
   // Filled in by GetAdapterAddresses. Note that the alternative
   // GetNetworkParams does not include IPv6 addresses.
   scoped_ptr<IP_ADAPTER_ADDRESSES, base::FreeDeleter> addresses;
 
   // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\SearchList
   RegString policy_search_list;
   // SYSTEM\CurrentControlSet\Tcpip\Parameters\SearchList
   RegString tcpip_search_list;
   // SYSTEM\CurrentControlSet\Tcpip\Parameters\Domain
   RegString tcpip_domain;
@@ skipping 61 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(DnsConfigServiceWin);
 };
 
 }  // namespace internal
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_CONFIG_SERVICE_WIN_H_