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

chrome/browser/resources/settings/certificate_manager_page/certificate_subentry.js

 // Copyright 2016 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-certificate-subentry represents an SSL certificate
  * sub-entry.
  */
 
 cr.define('settings', function() {
@@ skipping 89 matching lines @@
     this.dispatchCertificateActionEvent_(CertificateAction.DELETE);
   },
 
   /**
    * @param {!Event} event
    * @private
    */
   onExportTap_: function(event) {
     this.closePopupMenu_();
     if (this.certificateType == CertificateType.PERSONAL) {
-      this.browserProxy_.exportPersonalCertificate(this.model.id)
-          .then(function() {
-            this.dispatchCertificateActionEvent_(
-                CertificateAction.EXPORT_PERSONAL);
-          }.bind(this), this.onRejected_.bind(this));
+      this.browserProxy_.exportPersonalCertificate(this.model.id).then(() => {
+        this.dispatchCertificateActionEvent_(CertificateAction.EXPORT_PERSONAL);
+      }, this.onRejected_.bind(this));
     } else {
       this.browserProxy_.exportCertificate(this.model.id);
     }
   },
 
   /**
    * @param {!CertificateType} certificateType
    * @param {!CertificateSubnode} model
    * @return {boolean} Whether the certificate can be edited.
    * @private
@@ skipping 28 matching lines @@
   closePopupMenu_: function() {
     this.$$('dialog[is=cr-action-menu]').close();
   },
 
   /** @private */
   onDotsTap_: function() {
     var actionMenu = /** @type {!CrActionMenuElement} */ (this.$.menu.get());
     actionMenu.showAt(this.$.dots);
   },
 });