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

chrome/browser/resources/settings/on_startup_page/startup_urls_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-startup-urls-page' is the settings page
  * containing the urls that will be opened when chrome is started.
  */
 
 Polymer({
@@ skipping 45 matching lines @@
 
   /**
    * The element to return focus to, when the startup-url-dialog is closed.
    * @private {?HTMLElement}
    */
   startupUrlDialogAnchor_: null,
 
   /** @override */
   attached: function() {
     this.getNtpExtension_();
-    this.addWebUIListener('update-ntp-extension', function(ntpExtension) {
+    this.addWebUIListener('update-ntp-extension', ntpExtension => {
       // Note that |ntpExtension| is empty if there is no NTP extension.
       this.ntpExtension_ = ntpExtension;
-    }.bind(this));
+    });
 
     this.browserProxy_ = settings.StartupUrlsPageBrowserProxyImpl.getInstance();
-    this.addWebUIListener('update-startup-pages', function(startupPages) {
+    this.addWebUIListener('update-startup-pages', startupPages => {
       // If an "edit" URL dialog was open, close it, because the underlying page
       // might have just been removed (and model indices have changed anyway).
       if (this.startupUrlDialogModel_)
         this.destroyUrlDialog_();
       this.startupPages_ = startupPages;
       this.updateScrollableContents();
-    }.bind(this));
+    });
     this.browserProxy_.loadStartupPages();
 
-    this.addEventListener(settings.EDIT_STARTUP_URL_EVENT, function(event) {
+    this.addEventListener(settings.EDIT_STARTUP_URL_EVENT, event => {
       this.startupUrlDialogModel_ = event.detail.model;
       this.startupUrlDialogAnchor_ = event.detail.anchor;
       this.showStartupUrlDialog_ = true;
       event.stopPropagation();
-    }.bind(this));
+    });
   },
 
   /** @private */
   getNtpExtension_: function() {
     settings.OnStartupBrowserProxyImpl.getInstance().getNtpExtension().then(
-        function(ntpExtension) {
+        ntpExtension => {
           this.ntpExtension_ = ntpExtension;
-        }.bind(this));
+        });
   },
 
   /**
    * @param {!Event} e
    * @private
    */
   onAddPageTap_: function(e) {
     e.preventDefault();
     this.showStartupUrlDialog_ = true;
     this.startupUrlDialogAnchor_ =
@@ skipping 38 matching lines @@
   /**
    * Determine whether to show the user defined startup pages.
    * @param {number} restoreOnStartup Enum value from prefValues_.
    * @return {boolean} Whether the open specific pages is selected.
    * @private
    */
   showStartupUrls_: function(restoreOnStartup) {
     return restoreOnStartup == this.prefValues_.OPEN_SPECIFIC;
   },
 });