Extract i18n behavior from settings.

chrome/browser/resources/settings/i18n_behavior/i18n_behavior.js

-// Copyright 2015 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.
-
-/**
- * @fileoverview
- * 'I18nBehavior' is a behavior to mix in loading of
- * internationalization strings.
- *
- * Example:
- *   behaviors: [
- *     I18nBehavior,
- *   ],
- *
- * @group Chrome Settings Elements
- */
-
-var I18nBehavior = {
-  /**
-   * @param {string} id The ID of the string to translate.
-   * @param {...var_args} Placeholders required by the string ($1-9).
-   * @return {string} A translated, substituted string.
-   */
-  i18n: function(id, var_args) {
-    return loadTimeData.getStringF.apply(loadTimeData, arguments);
-  },
-};