Enforce WARN_UNUSED_RESULT attribute on Windows

net/dns/address_sorter_win.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/dns/address_sorter.h"
 
 #include <winsock2.h>
 
 #include <algorithm>
 
@@ skipping 91 matching lines @@
       closesocket(sock);
     }
 
     // Executed on the calling thread.
     void OnComplete() {
       AddressList list;
       if (success_) {
         list.reserve(output_buffer_->iAddressCount);
         for (int i = 0; i < output_buffer_->iAddressCount; ++i) {
           IPEndPoint ipe;
-          ipe.FromSockAddr(output_buffer_->Address[i].lpSockaddr,
-                           output_buffer_->Address[i].iSockaddrLength);
+          bool result =
+              ipe.FromSockAddr(output_buffer_->Address[i].lpSockaddr,
+                               output_buffer_->Address[i].iSockaddrLength);
+          DCHECK(result) << "Unable to roundtrip between IPEndPoint and "
+                         << "SOCKET_ADDRESS!";
           // Unmap V4MAPPED IPv6 addresses so that Happy Eyeballs works.
           if (IsIPv4Mapped(ipe.address())) {
             ipe = IPEndPoint(ConvertIPv4MappedToIPv4(ipe.address()),
                                                      ipe.port());
           }
           list.push_back(ipe);
         }
       }
       callback_.Run(success_, list);
     }
@@ skipping 65 matching lines @@
 
 // static
 scoped_ptr<AddressSorter> AddressSorter::CreateAddressSorter() {
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     return scoped_ptr<AddressSorter>(new AddressSorterWinXP());
   return scoped_ptr<AddressSorter>(new AddressSorterWin());
 }
 
 }  // namespace net