// 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 BASE_CALLBACK_FORWARD_H_#define BASE_CALLBACK_FORWARD_H_namespacebase{template<typenameSig>classCallback;typedefCallback<void(void)>Closure;}// namespace base#endif // BASE_CALLBACK_FORWARD_H