Reduce header dependencies in net/

net/http/http_network_transaction.h

 // Copyright (c) 2006-2008 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_HTTP_HTTP_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <string>
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "net/base/address_list.h"
 #include "net/base/client_socket_handle.h"
 #include "net/base/host_resolver.h"
+#include "net/base/io_buffer.h"
 #include "net/base/ssl_config_service.h"
 #include "net/http/http_auth.h"
 #include "net/http/http_auth_handler.h"
 #include "net/http/http_response_info.h"
 #include "net/http/http_transaction.h"
 #include "net/proxy/proxy_service.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 namespace net {
 
@@ skipping 358 matching lines @@
     STATE_DRAIN_BODY_FOR_AUTH_RESTART,
     STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE,
     STATE_NONE
   };
   State next_state_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_