MD Settings: Convert all usages of .bind(this) to use ES6 arrow function.

chrome/browser/resources/settings/people_page/user_list.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
  * 'settings-user-list' shows a list of users whitelisted on this Chrome OS
  * device.
  *
  * Example:
@@ skipping 29 matching lines @@
      * @type {boolean}
      */
     disabled: {
       type: Boolean,
       value: false,
     }
   },
 
   /** @override */
   ready: function() {
-    chrome.settingsPrivate.onPrefsChanged.addListener(function(prefs) {
+    chrome.settingsPrivate.onPrefsChanged.addListener(prefs => {
       prefs.forEach(function(pref) {
         if (pref.key == 'cros.accounts.users') {
-          chrome.usersPrivate.getWhitelistedUsers(function(users) {
+          chrome.usersPrivate.getWhitelistedUsers(users => {
             this.setUsers_(users);
-          }.bind(this));
+          });
         }
       }, this);
-    }.bind(this));
+    });
   },
 
   /** @protected */
   currentRouteChanged: function() {
     if (settings.getCurrentRoute() == settings.routes.ACCOUNTS) {
-      chrome.usersPrivate.getWhitelistedUsers(function(users) {
+      chrome.usersPrivate.getWhitelistedUsers(users => {
         this.setUsers_(users);
-      }.bind(this));
+      });
     }
   },
 
   /**
    * @param {!chrome.usersPrivate.User} user
    * @return {string}
    * @private
    */
   getUserName_: function(user) {
     return user.isOwner ? this.i18n('deviceOwnerLabel', user.name) : user.name;
@@ skipping 37 matching lines @@
   },
 
   /**
    * @param {chrome.usersPrivate.User} user
    * @private
    */
   shouldShowEmail_: function(user) {
     return !user.isSupervised && user.name != user.displayEmail;
   },
 });