Hide/Disable several (meaningless) options in Settings uber-page for Guest.

chrome/browser/resources/options2/language_options.js

Index: chrome/browser/resources/options2/language_options.js
diff --git a/chrome/browser/resources/options2/language_options.js b/chrome/browser/resources/options2/language_options.js
index fd6f016ff12df802fac0bf5051795eb2c876d24a..9f17ec02d7102f7209b31ab1cfba7de8cf1c7287 100644
--- a/chrome/browser/resources/options2/language_options.js
+++ b/chrome/browser/resources/options2/language_options.js
@@ -361,7 +361,7 @@ cr.define('options', function() {
       } else if (languageCode in templateData.uiLanguageCodeSet) {
         // If the language is supported as UI language, users can click on
         // the button to change the UI language.
-        if (cr.commandLine && cr.commandLine.options['--bwsi']) {
+        if (cr.isChromeOS && AccountsOptions.loggedInAsGuest()) {
           // In the guest mode for ChromeOS, changing UI language does not make
           // sense because it does not take effect after browser restart.
           uiLanguageButton.hidden = true;