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

chrome/browser/resources/settings/certificate_manager_page/ca_trust_edit_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 'settings-ca-trust-edit-dialog' allows the user to
  *  - specify the trust level of a certificate authority that is being
  *    imported.
  *  - edit the trust level of an already existing certificate authority.
  */
@@ skipping 21 matching lines @@
 
   /** @override */
   attached: function() {
     this.explanationText_ = loadTimeData.getStringF(
         'certificateManagerCaTrustEditDialogExplanation', this.model.name);
 
     // A non existing |model.id| indicates that a new certificate is being
     // imported, otherwise an existing certificate is being edited.
     if (this.model.id) {
       this.browserProxy_.getCaCertificateTrust(this.model.id)
-          .then(
-              /** @param {!CaTrustInfo} trustInfo */
-              function(trustInfo) {
-                this.trustInfo_ = trustInfo;
-                this.$.dialog.showModal();
-              }.bind(this));
+          .then(trustInfo => {
+            this.trustInfo_ = trustInfo;
+            this.$.dialog.showModal();
+          });
     } else {
       /** @type {!CrDialogElement} */ (this.$.dialog).showModal();
     }
   },
 
   /** @private */
   onCancelTap_: function() {
     /** @type {!CrDialogElement} */ (this.$.dialog).close();
   },
 
   /** @private */
   onOkTap_: function() {
     this.$.spinner.active = true;
 
     var whenDone = this.model.id ?
         this.browserProxy_.editCaCertificateTrust(
             this.model.id, this.$.ssl.checked, this.$.email.checked,
             this.$.objSign.checked) :
         this.browserProxy_.importCaCertificateTrustSelected(
             this.$.ssl.checked, this.$.email.checked, this.$.objSign.checked);
 
     whenDone.then(
-        function() {
+        () => {
           this.$.spinner.active = false;
           /** @type {!CrDialogElement} */ (this.$.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));
+        });
   },
 });