net: address review comments for NetLogWithSource renaming

net/dns/dns_transaction.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_TRANSACTION_H_
 #define NET_DNS_DNS_TRANSACTION_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
-class NetLogWithSource;
 class DnsResponse;
 class DnsSession;
+class NetLogWithSource;
 
 // DnsTransaction implements a stub DNS resolver as defined in RFC 1034.
 // The DnsTransaction takes care of retransmissions, name server fallback (or
 // round-robin), suffix search, and simple response validation ("does it match
 // the query") to fight poisoning.
 //
 // Destroying DnsTransaction cancels the underlying network effort.
 class NET_EXPORT_PRIVATE DnsTransaction {
  public:
   virtual ~DnsTransaction() {}
@@ skipping 39 matching lines @@
   // Creates a DnsTransactionFactory which creates DnsTransactionImpl using the
   // |session|.
   static std::unique_ptr<DnsTransactionFactory> CreateFactory(
       DnsSession* session) WARN_UNUSED_RESULT;
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_TRANSACTION_H_