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

chrome/browser/resources/settings/people_page/users_page.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-users-page' is the settings page for managing user accounts on
  * the device.
  */
 Polymer({
@@ skipping 16 matching lines @@
 
     /** @private */
     isWhitelistManaged_: {
       type: Boolean,
       value: false,
     },
   },
 
   /** @override */
   created: function() {
-    chrome.usersPrivate.isCurrentUserOwner(function(isOwner) {
+    chrome.usersPrivate.isCurrentUserOwner(isOwner => {
       this.isOwner_ = isOwner;
-    }.bind(this));
+    });
 
-    chrome.usersPrivate.isWhitelistManaged(function(isWhitelistManaged) {
+    chrome.usersPrivate.isWhitelistManaged(isWhitelistManaged => {
       this.isWhitelistManaged_ = isWhitelistManaged;
-    }.bind(this));
+    });
   },
 
   /**
    * @param {!Event} e
    * @private
    */
   openAddUserDialog_: function(e) {
     e.preventDefault();
     this.$.addUserDialog.open();
   },
@@ skipping 17 matching lines @@
    * @param {boolean} isOwner
    * @param {boolean} isWhitelistManaged
    * @param {boolean} allowGuest
    * @private
    * @return {boolean}
    */
   isEditingUsersDisabled_: function(isOwner, isWhitelistManaged, allowGuest) {
     return !isOwner || isWhitelistManaged || allowGuest;
   }
 });