MD Settings: reduce complexity and overhead of prefs singleton

chrome/test/data/webui/settings/fake_settings_private.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 Fake implementation of chrome.settingsPrivate for testing. */
 cr.define('settings', function() {
   /**
    * Creates a deep copy of the object.
    * @param {!Object} obj
    * @return {!Object}
    */
   function deepCopy(obj) {
     return JSON.parse(JSON.stringify(obj));
   }
 
   /**
    * Fake of chrome.settingsPrivate API. Use by setting
    * CrSettingsPrefs.deferInitialization to true, then passing a
-   * FakeSettingsPrivate to SettingsPrefs.initializeForTesting.
+   * FakeSettingsPrivate to settings-prefs#initialize().
    * @constructor
    * @param {Array<!settings.FakeSettingsPrivate.Pref>=} opt_initialPrefs
    * @implements {SettingsPrivate}
    */
   function FakeSettingsPrivate(opt_initialPrefs) {
     this.prefs = {};
 
     if (!opt_initialPrefs)
       return;
     for (var pref of opt_initialPrefs)
@@ skipping 92 matching lines @@
 
   return {FakeSettingsPrivate: FakeSettingsPrivate};
 });
 
 /**
  * @type {Array<{key: string,
  *               type: chrome.settingsPrivate.PrefType,
  *               values: !Array<*>}>}
  */
 settings.FakeSettingsPrivate.Pref;