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

chrome/browser/resources/options2/advanced_options.js

Index: chrome/browser/resources/options2/advanced_options.js
diff --git a/chrome/browser/resources/options2/advanced_options.js b/chrome/browser/resources/options2/advanced_options.js
index d3e712ac45ce18bdd29c972b064707dc588788eb..931af1b0a69fe233783448651daca18feb514bd5 100644
--- a/chrome/browser/resources/options2/advanced_options.js
+++ b/chrome/browser/resources/options2/advanced_options.js
@@ -34,8 +34,8 @@ cr.define('options', function() {
       // Date and time section (CrOS only).
       if (cr.isChromeOS && AccountsOptions.loggedInAsGuest()) {
         // Disable time-related settings if we're not logged in as a real user.
-        $('timezone-select').disabled = true;
-        $('use-24hour-clock').disabled = true;
+        AccountsOptions.disableElementsForGuest($('timezone-select'));
+        AccountsOptions.disableElementsForGuest($('use-24hour-clock'));
       }
 
       // Privacy section.
@@ -57,6 +57,12 @@ cr.define('options', function() {
               [String(event.target.checked)]);
         };
       }
+      if (cr.isChromeOS && AccountsOptions.loggedInAsGuest()) {
+        AccountsOptions.disableElementsForGuest(
+            $('search-suggest-enabled-group'));
+        AccountsOptions.disableElementsForGuest(
+            $('dns-prefetching-enabled-group'));
+      }
 
       // Bluetooth (CrOS only).
       if (cr.isChromeOS) {
@@ -106,7 +112,7 @@ cr.define('options', function() {
         chrome.send('coreOptionsUserMetricsAction',
             ['Options_ShowPasswordManager']);
       };
-      if (AdvancedOptions.GuestModeActive()) {
+      if (cr.isChromeOS && AccountsOptions.loggedInAsGuest()) {
         // Disable and turn off Autofill in guest mode.
         var autofillEnabled = $('autofill-enabled');
         autofillEnabled.disabled = true;
@@ -122,9 +128,10 @@ cr.define('options', function() {
         $('manage-passwords').disabled = true;
 
         // Hide the entire section on ChromeOS
-        if (cr.isChromeOS)
-          $('passwords-and-autofill-section').hidden = true;
+        AccountsOptions.disableElementsForGuest(
+            $('passwords-and-autofill-section'));
       }
+
       $('mac-passwords-warning').hidden =
           !(localStrings.getString('macPasswordsWarning'));
 
@@ -260,15 +267,6 @@ cr.define('options', function() {
     }
   };
 
-  /**
-   * Returns whether the browser in guest mode. Some features are disabled or
-   * hidden in guest mode.
-   * @return {boolean} True if guest mode is currently active.
-   */
-  AdvancedOptions.GuestModeActive = function() {
-    return cr.commandLine && cr.commandLine.options['--bwsi'];
-  };
-
   // Set the font size selected item.
   AdvancedOptions.SetFontSize = function(font_size_value) {
     var selectCtl = $('defaultFontSize');