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

chrome/browser/resources/settings/site_settings_page/site_settings_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-site-settings-page' is the settings page containing privacy and
  * security site settings.
  */
 
@@ skipping 70 matching lines @@
      [R.SITE_SETTINGS_POPUPS, 'popups'],
      [R.SITE_SETTINGS_BACKGROUND_SYNC, 'background-sync'],
      [R.SITE_SETTINGS_AUTOMATIC_DOWNLOADS, 'automatic-downloads'],
      [R.SITE_SETTINGS_UNSANDBOXED_PLUGINS, 'unsandboxed-plugins'],
      [R.SITE_SETTINGS_HANDLERS, 'protocol-handlers'],
      [R.SITE_SETTINGS_MIDI_DEVICES, 'midi-devices'],
      [R.SITE_SETTINGS_ADS, 'ads'], [R.SITE_SETTINGS_ZOOM_LEVELS, 'zoom-levels'],
      [R.SITE_SETTINGS_USB_DEVICES, 'usb-devices'],
      [R.SITE_SETTINGS_PDF_DOCUMENTS, 'pdf-documents'],
      [R.SITE_SETTINGS_PROTECTED_CONTENT, 'protected-content'],
-    ].forEach(function(pair) {
+    ].forEach(pair => {
       var route = pair[0];
       var id = pair[1];
       this.focusConfig.set(route.path, '* /deep/ #' + id + ' .subpage-arrow');
-    }.bind(this));
+    });
   },
 
   /** @override */
   ready: function() {
     this.ContentSettingsTypes = settings.ContentSettingsTypes;
     this.ALL_SITES = settings.ALL_SITES;
 
     var keys = Object.keys(settings.ContentSettingsTypes);
     for (var i = 0; i < keys.length; ++i) {
       var key = settings.ContentSettingsTypes[keys[i]];
@@ skipping 33 matching lines @@
       return other;
     return enabled;
   },
 
   /**
    * @param {string} category The category to update.
    * @private
    */
   updateDefaultValueLabel_: function(category) {
     this.browserProxy.getDefaultValueForContentType(category).then(
-        function(defaultValue) {
+        defaultValue => {
           this.set(
               'default_.' + Polymer.CaseMap.dashToCamelCase(category),
               defaultValue.setting);
-        }.bind(this));
+        });
   },
 
   /**
    * The protocol handlers have a separate enabled/disabled notifier.
    * @param {boolean} enabled
    * @private
    */
   updateHandlersEnabled_: function(enabled) {
     var category = settings.ContentSettingsTypes.PROTOCOL_HANDLERS;
     this.set(
         'default_.' + Polymer.CaseMap.dashToCamelCase(category),
         enabled ? settings.ContentSetting.ALLOW :
                   settings.ContentSetting.BLOCK);
   },
 
   /**
    * Navigate to the route specified in the event dataset.
    * @param {!Event} event The tap event.
    * @private
    */
   onTapNavigate_: function(event) {
     var dataSet = /** @type {{route: string}} */ (event.currentTarget.dataset);
     settings.navigateTo(settings.routes[dataSet.route]);
   },
 });