UI polish for certificate viewer

chrome/browser/resources/certificate_viewer.js

 // Copyright (c) 2011 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('cert_viewer', function() {
   'use strict';
 
   /**
    * Initialize the certificate viewer dialog by wiring up the close button,
    * substituting in translated strings and requesting certificate details.
    */
   function initialize() {
-    $('close').onclick = function() {
-      window.close();
-    }
     $('export').onclick = exportCertificate;
     cr.ui.decorate('tabbox', cr.ui.TabBox);
 
     initializeTree($('hierarchy'), showCertificateFields);
     initializeTree($('cert-fields'), showCertificateFieldValue);
 
     i18nTemplate.process(document, templateData);
     stripGtkAccessorKeys();
     chrome.send('requestCertificateInfo');
   }
@@ skipping 144 matching lines @@
   }
 
   return {
     initialize: initialize,
     getCertificateInfo: getCertificateInfo,
     getCertificateFields: getCertificateFields,
   };
 });
 
 document.addEventListener('DOMContentLoaded', cert_viewer.initialize);