WebUI: Enable ESLint rule for missing semicolons.

chrome/browser/resources/sync_file_system_internals/task_log.js

 // Copyright 2014 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.
 
 var TaskLog = (function() {
 'use strict';
 
 var nextTaskLogSeq = 1;
 var TaskLog = {};
 
@@ skipping 26 matching lines @@
   var tr = document.createElement('tr');
   tr.appendChild(createElementFromText(
       'td', taskLog.duration, {'class': 'task-log-duration'}));
   tr.appendChild(createElementFromText(
       'td', taskLog.task_description, {'class': 'task-log-description'}));
   tr.appendChild(createElementFromText(
       'td', taskLog.result_description, {'class': 'task-log-result'}));
   tr.appendChild(details);
 
   $('task-log-entries').appendChild(tr);
-}
+};
 
 /**
  * Get initial sync service values and set listeners to get updated values.
  */
 function main() {
   observeTaskLog();
 }
 
 document.addEventListener('DOMContentLoaded', main);
 return TaskLog;
 })();