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

chrome/browser/resources/settings/certificate_manager_page/certificate_password_decryption_dialog.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 A dialog prompting the user for a decryption password such that
  * a previously exported personal certificate can be imported.
  */
 Polymer({
   is: 'settings-certificate-password-decryption-dialog',
@@ skipping 21 matching lines @@
 
   /** @private */
   onCancelTap_: function() {
     /** @type {!CrDialogElement} */ (this.$.dialog).close();
   },
 
   /** @private */
   onOkTap_: function() {
     this.browserProxy_.importPersonalCertificatePasswordSelected(this.password_)
         .then(
-            function() {
+            () => {
               /** @type {!CrDialogElement} */ (this.$.dialog).close();
-            }.bind(this),
-            /** @param {!CertificatesError} error */
-            function(error) {
+            },
+            error => {
               /** @type {!CrDialogElement} */ (this.$.dialog).close();
               this.fire('certificates-error', {error: error, anchor: null});
-            }.bind(this));
+            });
   },
 });