Fix some lingering WebUI focus issues.

chrome/browser/resources/extensions/extension_error_overlay.js

 // Copyright 2013 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.
 
 cr.define('extensions', function() {
   'use strict';
 
   /**
    * Clear all the content of a given element.
    * @param {HTMLElement} element The element to be cleared.
@@ skipping 274 matching lines @@
      *     hide the ExtensionErrorOverlay; this should take a single parameter
      *     which is either the overlay Div if the overlay should be displayed,
      *     or null if the overlay should be hidden.
      */
     initializePage: function(showOverlay) {
       var overlay = $('overlay');
       cr.ui.overlay.setupOverlay(overlay);
       cr.ui.overlay.globalInitialization();
       overlay.addEventListener('cancelOverlay', this.handleDismiss_.bind(this));
 
-      $('extension-error-overlay-dismiss').addEventListener(
-          'click', this.handleDismiss_.bind(this));
+      $('extension-error-overlay-dismiss').addEventListener('click',
+          function() {
+        cr.dispatchSimpleEvent(overlay, 'cancelOverlay');
+      });
 
       /**
        * The element of the full overlay.
        * @type {HTMLDivElement}
        * @private
        */
       this.overlayDiv_ = /** @type {HTMLDivElement} */(
           $('extension-error-overlay'));
 
       /**
@@ skipping 177 matching lines @@
           loadTimeData.getString('extensionErrorOverlayNoCodeToDisplay'));
       this.setVisible(true);
     },
   };
 
   // Export
   return {
     ExtensionErrorOverlay: ExtensionErrorOverlay
   };
 });