Fix some lingering WebUI focus issues.

chrome/browser/resources/extensions/pack_extension_overlay.js

 // Copyright (c) 2012 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() {
   /**
    * PackExtensionOverlay class
    * Encapsulated handling of the 'Pack Extension' overlay page.
    * @constructor
    */
   function PackExtensionOverlay() {
   }
 
   cr.addSingletonGetter(PackExtensionOverlay);
 
   PackExtensionOverlay.prototype = {
     /**
      * Initialize the page.
      */
     initializePage: function() {
       var overlay = $('overlay');
       cr.ui.overlay.setupOverlay(overlay);
       cr.ui.overlay.globalInitialization();
       overlay.addEventListener('cancelOverlay', this.handleDismiss_.bind(this));
 
-      $('pack-extension-dismiss').addEventListener('click',
-          this.handleDismiss_.bind(this));
+      $('pack-extension-dismiss').addEventListener('click', function() {
+        cr.dispatchSimpleEvent(overlay, 'cancelOverlay');
+      });
       $('pack-extension-commit').addEventListener('click',
           this.handleCommit_.bind(this));
       $('browse-extension-dir').addEventListener('click',
           this.handleBrowseExtensionDir_.bind(this));
       $('browse-private-key').addEventListener('click',
           this.handleBrowsePrivateKey_.bind(this));
     },
 
     /**
      * Handles a click on the dismiss button.
@@ skipping 120 matching lines @@
                              alertCancelCallback);
       extensions.ExtensionSettings.showOverlay($('alertOverlay'));
     },
   };
 
   // Export
   return {
     PackExtensionOverlay: PackExtensionOverlay
   };
 });