Cleanup: Remove unneeded forward declararations in net.

net/dns/async_host_resolver.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_ASYNC_HOST_RESOLVER_H_
 #define NET_DNS_ASYNC_HOST_RESOLVER_H_
 #pragma once
 
 #include <list>
 #include <map>
 
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "net/base/address_family.h"
 #include "net/base/host_cache.h"
 #include "net/base/host_resolver.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_log.h"
 #include "net/base/rand_callback.h"
 #include "net/dns/dns_transaction.h"
 
 namespace net {
 
-class AddressesList;
 class ClientSocketFactory;
 
 class NET_EXPORT AsyncHostResolver
     : public HostResolver,
       public DnsTransaction::Delegate,
       NON_EXPORTED_BASE(public base::NonThreadSafe) {
  public:
   AsyncHostResolver(const IPEndPoint& dns_server,
                     size_t max_transactions,
                     size_t max_pending_requests_,
@@ skipping 119 matching lines @@
   int next_request_id_;
 
   NetLog* net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncHostResolver);
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_ASYNC_HOST_RESOLVER_H_