[Sync] Move some things from driver to base.

components/sync/driver/system_encryptor.h

Index: components/sync/driver/system_encryptor.h
diff --git a/components/sync/driver/system_encryptor.h b/components/sync/driver/system_encryptor.h
deleted file mode 100644
index 4b7aceca1ba9612768c720f52662d692da3dd8f3..0000000000000000000000000000000000000000
--- a/components/sync/driver/system_encryptor.h
+++ /dev/null
@@ -1,29 +0,0 @@
-// 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 syncer {
-
-// Encryptor that uses the Chrome password manager's encryptor.
-class SystemEncryptor : public 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 syncer
-
-#endif  // COMPONENTS_SYNC_DRIVER_SYSTEM_ENCRYPTOR_H_