WebUI: Fix violations of no-extra-semi lint rule.

chrome/browser/resources/chromeos/switch_access/options.js

 // Copyright 2017 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.
 
 /**
  * Alias for document.getElementById.
  *
  * @param  {string} id
  * @return {Element}
  */
@@ skipping 13 matching lines @@
    * User preferences.
    *
    * @type {SwitchAccessPrefs}
    */
   this.switchAccessPrefs_ = background.switchAccess.switchAccessPrefs;
 
   this.init_();
   document.addEventListener('change', this.handleInputChange_.bind(this));
   background.document.addEventListener(
       'prefsUpdate', this.handlePrefsUpdate_.bind(this));
-};
+}
 
 SwitchAccessOptions.prototype = {
   /**
    * Initialize the options page by setting all elements representing a user
    * preference to show the correct value.
    *
    * @private
    */
   init_: function() {
     $('enableAutoScan').checked =
@@ skipping 58 matching lines @@
           $(key).value = updatedPrefs[key] / 1000;
           break;
       }
     }
   }
 };
 
 document.addEventListener('DOMContentLoaded', function() {
   new SwitchAccessOptions();
 });