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diff --git a/components/user_manager/user_id.h b/components/user_manager/user_id.h
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+++ b/components/user_manager/user_id.h
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+// Copyright 2015 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 COMPONENTS_USER_MANAGER_USER_ID_H_
+#define COMPONENTS_USER_MANAGER_USER_ID_H_
+
+#include <string>
+
+namespace user_manager {
+
+// Type that contains enough information to identify user on ChromeOS.
+typedef std::string UserID;
+
+}  // namespace user_manager
+
+#endif  // COMPONENTS_USER_MANAGER_USER_ID_H_