[Hotword] Remove unneeded preferences. Cleaning up look of settings.

chrome/browser/resources/options/browser_options.js

 // Copyright (c) 2012 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('options', function() {
   var OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
 
   //
@@ skipping 110 matching lines @@
 
       Preferences.getInstance().addEventListener('homepage',
           this.onHomePageChanged_.bind(this));
       Preferences.getInstance().addEventListener('homepage_is_newtabpage',
           this.onHomePageIsNtpChanged_.bind(this));
 
       $('change-home-page').onclick = function(event) {
         OptionsPage.navigateToPage('homePageOverlay');
       };
 
-      Preferences.getInstance().addEventListener('hotword.search_enabled',
-          this.onHotwordSearchPrefChanged_.bind(this));
       chrome.send('requestHotwordAvailabile');
 
       if ($('set-wallpaper')) {
         $('set-wallpaper').onclick = function(event) {
           chrome.send('openWallpaperManager');
         };
       }
 
       $('themes-gallery').onclick = function(event) {
         window.open(loadTimeData.getString('themesGalleryURL'));
@@ skipping 740 matching lines @@
 
     /**
      * Activates the Hotword section from the System settings page.
      * @private
      */
     showHotwordSection_: function() {
       $('hotword-search').hidden = false;
     },
 
     /**
-     * Event listener for the 'hotword search enabled' preference. Shows/hides
-     * the UI for updating hotword settings..
-     * @param {Event} event The preference change event.
-     */
-    onHotwordSearchPrefChanged_: function(event) {
-      var section = $('hotword-settings-section');
-      var container = $('hotword-settings-section-container');
-      // event.value is a dictionary with details about the preference that was
-      // changed. Within that dictionary, |value| is the new value of the
-      // preference. In this case, the preference represents a Boolean so it
-      // can be checked for true/false.
-      if (event.value.value)
-        this.showSectionWithAnimation_(section, container);
-      else
-        this.hideSectionWithAnimation_(section, container);
-    },
-
-    /**
      * Event listener for the 'homepage is NTP' preference. Updates the label
      * next to the 'Change' button.
      * @param {Event} event The preference change event.
      */
     onHomePageIsNtpChanged_: function(event) {
       if (!event.value.uncommitted) {
         $('home-page-url').hidden = event.value.value;
         $('home-page-ntp').hidden = !event.value.value;
       }
     },
@@ skipping 722 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });