Fix CrSettingsPrivacyPageTest.PrivacyPage test failure.

chrome/browser/resources/settings/site_settings/site_data.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
  * 'site-data' handles showing the local storage summary list for all sites.
  */
 
 Polymer({
@@ skipping 66 matching lines @@
    * @private
    */
   onSiteTap_: function(event) {
     var dialog = document.createElement('site-data-details-dialog');
     dialog.category = this.category;
     this.shadowRoot.appendChild(dialog);
 
     var node = this.treeNodes_.fetchNodeById(event.model.item.id, false);
     dialog.open(node);
 
-    dialog.addEventListener('iron-overlay-closed', function(event) {
-      // The drop-down box in the dialog also generates iron-overlay-closed.
-      // Ignore anything but that event coming from a dialog object.
-      if (event.path[0].id == 'dialog')
-        dialog.remove();
+    dialog.addEventListener('close', function(event) {
+      dialog.remove();
     });
   },
 });