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diff --git a/crypto/scoped_test_nss_chromeos_user.h b/crypto/scoped_test_nss_chromeos_user.h
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+++ b/crypto/scoped_test_nss_chromeos_user.h
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+// Copyright 2014 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 CRYPTO_SCOPED_TEST_NSS_CHROMEOS_USER_H_
+#define CRYPTO_SCOPED_TEST_NSS_CHROMEOS_USER_H_
+
+#include <string>
+
+#include "base/files/scoped_temp_dir.h"
+#include "base/macros.h"
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// Opens a persistent NSS software database in a temporary directory for the
+// user with |username_hash|. This database will be used for both the user's
+// public and private slot.
+class CRYPTO_EXPORT_PRIVATE ScopedTestNSSChromeOSUser {
+ public:
+  // Opens the software database and sets the public slot for the user. The
+  // private slot will not be initialized until FinishInit() is called.
+  explicit ScopedTestNSSChromeOSUser(const std::string& username_hash);
+  ~ScopedTestNSSChromeOSUser();
+
+  std::string username_hash() const { return username_hash_; }
+  bool constructed_successfully() const { return constructed_successfully_; }
+
+  // Completes initialization of user. Causes any waiting private slot callbacks
+  // to run, see GetPrivateSlotForChromeOSUser().
+  void FinishInit();
+
+ private:
+  const std::string username_hash_;
+  base::ScopedTempDir temp_dir_;
+  bool constructed_successfully_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedTestNSSChromeOSUser);
+};
+
+}  // namespace crypto
+
+#endif  // CRYPTO_SCOPED_TEST_NSS_CHROMEOS_USER_H_