Fix net_export.h includes.

net/http/http_auth_handler_ntlm.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_HTTP_HTTP_AUTH_HANDLER_NTLM_H_
 #define NET_HTTP_HTTP_AUTH_HANDLER_NTLM_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 10 matching lines @@
 #if defined(NTLM_SSPI)
 #define SECURITY_WIN32 1
 #include <windows.h>
 #include <security.h>
 #include "net/http/http_auth_sspi_win.h"
 #endif
 
 #include <string>
 
 #include "base/strings/string16.h"
+#include "net/base/net_export.h"
 #include "net/http/http_auth_handler.h"
 #include "net/http/http_auth_handler_factory.h"
 
 namespace net {
 
 class HttpAuthPreferences;
 
 // Code for handling HTTP NTLM authentication.
 class NET_EXPORT_PRIVATE HttpAuthHandlerNTLM : public HttpAuthHandler {
  public:
@@ skipping 126 matching lines @@
   std::string auth_data_;
 
 #if defined(NTLM_SSPI)
   const HttpAuthPreferences* http_auth_preferences_;
 #endif
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_NTLM_H_