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

chrome/browser/resources/chromeos/switch_access/prefs.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.
 
 /**
  * Class to manage user preferences.
  *
  * @constructor
  */
 function SwitchAccessPrefs() {
   /**
    * User preferences, initially set to the default preference values.
    *
    * @private
    */
   this.prefs_ = Object.assign({}, this.DEFAULT_PREFS);
 
   this.loadPrefs_();
   chrome.storage.onChanged.addListener(this.handleStorageChange_.bind(this));
-};
+}
 
 SwitchAccessPrefs.prototype = {
   /**
    * Asynchronously load the current preferences from chrome.storage.sync and
    * store them in this.prefs_, if this.prefs_ is not already set to that value.
    * If this.prefs_ changes, fire a prefsUpdate event.
    *
    * @private
    */
   loadPrefs_: function() {
@@ skipping 98 matching lines @@
    * The default value of all preferences. All preferences should be primitives
    * to prevent changes to default values.
    *
    * @const
    */
   DEFAULT_PREFS: {
     'enableAutoScan': false,
     'autoScanTime': 800
   }
 };