Implement LoginDatabase on all platforms.

chrome/browser/password_manager/login_database_posix.cc

+// Copyright (c) 2010 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 "base/string_util.h"
+#include "chrome/browser/password_manager/login_database.h"
+
+// TODO: Actually encrypt passwords on Linux.
+
+std::string LoginDatabase::EncryptedString(const string16& plain_text)
+    const {
+  return UTF16ToASCII(plain_text);
+}
+
+string16 LoginDatabase::DecryptedString(const std::string& cipher_text)
+    const {
+  return ASCIIToUTF16(cipher_text);
+}