Fine tuned availability of hotword plugin.

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index cc01414f19c8147c0156f394c0a52791de7edb93..f3c250bde3957f4bf1aa2b3a0b79bacabaa462b9 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -877,6 +877,14 @@ cr.define('options', function() {
     },
 
     /**
+     * Activates the option about the hotword in the app-list.
+     * @private
+     */
+    showAppListHotword_: function() {
+      $('hotword-app-list').hidden = false;
+    },
+
+    /**
      * Activates the Hotword section from the System settings page.
      * @private
      */
@@ -1581,6 +1589,7 @@ cr.define('options', function() {
     'showCreateProfileError',
     'showCreateProfileSuccess',
     'showCreateProfileWarning',
+    'showAppListHotword',
     'showHotwordSection',
     'showManagedUserImportError',
     'showManagedUserImportSuccess',