Allow embedder to use custom cryptography in Autofill table.

components/autofill/core/browser/webdata/system_encryptor.cc

+// Copyright 2017 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.
+
+#include "components/autofill/core/browser/webdata/system_encryptor.h"
+
+#include "components/os_crypt/os_crypt.h"
+
+namespace autofill {
+
+bool SystemEncryptor::EncryptString16(const base::string16& plaintext,
+                                      std::string* ciphertext) const {
+  return ::OSCrypt::EncryptString16(plaintext, ciphertext);
+}
+
+bool SystemEncryptor::DecryptString16(const std::string& ciphertext,
+                                      base::string16* plaintext) const {
+  return ::OSCrypt::DecryptString16(ciphertext, plaintext);
+}
+
+}  // namespace autofill