Migrate net/socket/socket.h, net/socket/stream_socket.h to base::Bind().

net/dns/dns_transaction.h

 // Copyright (c) 2011 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_TRANSACTION_H_
 #define NET_DNS_DNS_TRANSACTION_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 117 matching lines @@
 
   // Number of retry attempts so far.
   size_t attempts_;
 
   // Timeouts in milliseconds.
   std::vector<base::TimeDelta> timeouts_ms_;
 
   State next_state_;
   ClientSocketFactory* socket_factory_;
   base::OneShotTimer<DnsTransaction> timer_;
-  OldCompletionCallbackImpl<DnsTransaction> io_callback_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsTransaction);
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_TRANSACTION_H_