Fix chrome://offline-internal page.

chrome/browser/resources/offline_pages/offline_internals.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.
 
 cr.define('offlineInternals', function() {
   'use strict';
 
   /** @type {!Array<OfflinePage>} */
   var offlinePages = [];
 
   /** @type {!Array<SavePageRequest>} */
   var savePageRequests = [];
 
-  /** @type {offlineInternals.OfflineInternalsBrowserProxy} */
-  var browserProxy_;
+  /** @type {!offlineInternals.OfflineInternalsBrowserProxy} */
+  var browserProxy_ =
+      offlineInternals.OfflineInternalsBrowserProxyImpl.getInstance();
 
   /**
    * Fill stored pages table.
    * @param {!Array<OfflinePage>} pages An array object representing
    *     stored offline pages.
    */
   function fillStoredPages(pages) {
     var storedPagesTable = $('stored-pages');
     storedPagesTable.textContent = '';
 
@@ skipping 148 matching lines @@
     $('download').onclick = download;
     $('log-model-on').onclick =
         browserProxy_.setRecordPageModel.bind(browserProxy_, true);
     $('log-model-off').onclick =
         browserProxy_.setRecordPageModel.bind(browserProxy_, false);
     $('log-request-on').onclick =
         browserProxy_.setRecordRequestQueue.bind(browserProxy_, true);
     $('log-request-off').onclick =
         browserProxy_.setRecordRequestQueue.bind(browserProxy_, false);
     $('refresh-logs').onclick = refreshLog;
-    browserProxy_ =
-        offlineInternals.OfflineInternalsBrowserProxyImpl.getInstance();
     refreshAll();
   }
 
   // Return an object with all of the exports.
   return {
     initialize: initialize,
   };
 });
 
 document.addEventListener('DOMContentLoaded', offlineInternals.initialize);