Extract ScopedTestNSSDB from nss_util.

crypto/scoped_test_nss_db.h

+// 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_DB_H_
+#define CRYPTO_SCOPED_TEST_NSS_DB_H_
+
+#include "base/files/scoped_temp_dir.h"
+#include "base/macros.h"
+#include "crypto/crypto_export.h"
+#include "crypto/scoped_nss_types.h"
+
+namespace crypto {
+
+// Opens a persistent NSS database in a temporary directory.
+// Prior NSS version 3.15.1, because of http://bugzil.la/875601 , the opened DB
+// will not be closed automatically.
+class CRYPTO_EXPORT_PRIVATE ScopedTestNSSDB {
+ public:
+  ScopedTestNSSDB();
+  ~ScopedTestNSSDB();
+
+  bool is_open() { return slot_; }
+  PK11SlotInfo* slot() { return slot_.get(); }
+
+ private:
+  base::ScopedTempDir temp_dir_;
+  ScopedPK11Slot slot_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedTestNSSDB);
+};
+
+}  // namespace crypto
+
+#endif  // CRYPTO_SCOPED_TEST_NSS_DB_H_