[Sync] Move //components/sync_driver to //components/sync/driver.

components/sync_driver/system_encryptor.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 COMPONENTS_SYNC_DRIVER_SYSTEM_ENCRYPTOR_H_
-#define COMPONENTS_SYNC_DRIVER_SYSTEM_ENCRYPTOR_H_
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "components/sync/base/encryptor.h"
-
-namespace sync_driver {
-
-// Encryptor that uses the Chrome password manager's encryptor.
-class SystemEncryptor : public syncer::Encryptor {
- public:
-  ~SystemEncryptor() override;
-
-  bool EncryptString(const std::string& plaintext,
-                     std::string* ciphertext) override;
-
-  bool DecryptString(const std::string& ciphertext,
-                     std::string* plaintext) override;
-};
-
-}  // namespace sync_driver
-
-#endif  // COMPONENTS_SYNC_DRIVER_SYSTEM_ENCRYPTOR_H_