Replace TOUCH_UI condition in WebUI with dynamic flag.

chrome/browser/resources/options/options.js

 // Copyright (c) 2011 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 AddLanguageOverlay = options.AddLanguageOverlay;
 var AdvancedOptions = options.AdvancedOptions;
 var AlertOverlay = options.AlertOverlay;
 var AutofillEditAddressOverlay = options.AutofillEditAddressOverlay;
 var AutofillEditCreditCardOverlay = options.AutofillEditCreditCardOverlay;
 var AutofillOptions = options.AutofillOptions;
@@ skipping 83 matching lines @@
     OptionsPage.registerSubPage(
         new OptionsPage('languageMozc',
                         templateData.languageMozcPageTabTitle,
                         'languageMozcPage'),
         LanguageOptions.getInstance());
     OptionsPage.registerSubPage(
         new OptionsPage('languagePinyin',
                         templateData.languagePinyinPageTabTitle,
                         'languagePinyinPage'),
         LanguageOptions.getInstance());
-    if (cr.isTouch) {
+    if ($('language-options-virtual-keyboard')) {
       OptionsPage.registerSubPage(VirtualKeyboardManager.getInstance(),
                                   LanguageOptions.getInstance());
     }
     OptionsPage.register(InternetOptions.getInstance());
   }
   OptionsPage.register(AdvancedOptions.getInstance());
   OptionsPage.registerSubPage(ContentSettings.getInstance(),
                               AdvancedOptions.getInstance(),
                               [$('privacyContentSettingsButton')]);
   OptionsPage.registerSubPage(ContentSettingsExceptionsArea.getInstance(),
@@ skipping 118 matching lines @@
 
 document.addEventListener('DOMContentLoaded', load);
 
 window.onpopstate = function(e) {
   options.OptionsPage.setState(e.state);
 };
 
 window.onbeforeunload = function() {
   options.OptionsPage.willClose();
 };