Revert "Typecheck JS files for chrome://extensions"

chrome/browser/resources/extensions/extension_error.js

Index: chrome/browser/resources/extensions/extension_error.js
diff --git a/chrome/browser/resources/extensions/extension_error.js b/chrome/browser/resources/extensions/extension_error.js
index 107da28daf1de8f1d5e7b91de93f2e598bac1dc0..28f3dc4832e1cf1741fa9b74bb130542efb1c31a 100644
--- a/chrome/browser/resources/extensions/extension_error.js
+++ b/chrome/browser/resources/extensions/extension_error.js
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+<include src="extension_error_overlay.js">
+
 cr.define('extensions', function() {
   'use strict';
 
@@ -11,8 +13,8 @@ cr.define('extensions', function() {
    * @return {HTMLElement} The clone of the template.
    */
   function cloneTemplate(templateName) {
-    return /** @type {HTMLElement} */($('template-collection-extension-error').
-        querySelector('.' + templateName).cloneNode(true));
+    return $('template-collection-extension-error').
+        querySelector('.' + templateName).cloneNode(true);
   }
 
   /**
@@ -42,10 +44,7 @@ cr.define('extensions', function() {
   ExtensionError.prototype = {
     __proto__: HTMLDivElement.prototype,
 
-    /**
-     * @param {RuntimeError} error
-     * @override
-     */
+    /** @override */
     decorate: function(error) {
       // Add an additional class for the severity level.
       if (error.level == 0)