MD Settings: Restore focus after closing dialogs, for certificate page.

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 55 matching lines @@
         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) {
       /** @type {!CrDialogElement} */ (this.$.dialog).close();
-      this.fire('certificates-error', error);
+      this.fire('certificates-error', {error: error, anchor: null});
     }.bind(this));
   },
 });