cryptohome: Move Encrypt/DecryptWithSystemSalt() out of CryptohomeLibrary

chromeos/cryptohome/mock_cryptohome_library.h

-// Copyright (c) 2012 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 CHROMEOS_CRYPTOHOME_MOCK_CRYPTOHOME_LIBRARY_H_
-#define CHROMEOS_CRYPTOHOME_MOCK_CRYPTOHOME_LIBRARY_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "chromeos/cryptohome/cryptohome_library.h"
-#include "testing/gmock/include/gmock/gmock.h"
-
-using ::testing::Invoke;
-using ::testing::WithArgs;
-using ::testing::_;
-
-namespace chromeos {
-
-class MockCryptohomeLibrary : public CryptohomeLibrary {
- public:
-  MockCryptohomeLibrary();
-  virtual ~MockCryptohomeLibrary();
-  MOCK_METHOD0(GetSystemSalt, std::string(void));
-
-  MOCK_METHOD1(EncryptWithSystemSalt, std::string(const std::string&));
-  MOCK_METHOD1(DecryptWithSystemSalt, std::string(const std::string&));
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MockCryptohomeLibrary);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROMEOS_CRYPTOHOME_MOCK_CRYPTOHOME_LIBRARY_H_