Guest mode causes certain settings to be hidden.

chrome/browser/ui/webui/options/options_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 276 matching lines @@
 #else
   AddOptionsPageUIHandler(localized_strings, new LanguageOptionsHandler());
 #endif
   AddOptionsPageUIHandler(localized_strings,
                           new LanguageDictionaryOverlayHandler());
   AddOptionsPageUIHandler(localized_strings, new ManageProfileHandler());
   AddOptionsPageUIHandler(localized_strings, new PasswordManagerHandler());
   AddOptionsPageUIHandler(localized_strings, new ResetProfileSettingsHandler());
   AddOptionsPageUIHandler(localized_strings, new SearchEngineManagerHandler());
   AddOptionsPageUIHandler(localized_strings, new ImportDataHandler());
-  AddOptionsPageUIHandler(localized_strings, new StartupPagesHandler());
   AddOptionsPageUIHandler(localized_strings,
                           new SupervisedUserCreateConfirmHandler());
   AddOptionsPageUIHandler(localized_strings, new SupervisedUserImportHandler());
   AddOptionsPageUIHandler(localized_strings,
                           new SupervisedUserLearnMoreHandler());
   AddOptionsPageUIHandler(localized_strings, new SyncSetupHandler(
       g_browser_process->profile_manager()));
   AddOptionsPageUIHandler(localized_strings, new WebsiteSettingsHandler());
+
+  // Disable back end handling for certain options for guest mode.
+  if (!Profile::FromWebUI(web_ui())->IsOffTheRecord()) {
+    AddOptionsPageUIHandler(localized_strings, new StartupPagesHandler());

[Evan Stade, 2014/08/19 20:41:15]

it suddenly occurs to me that this might trigger one of the expect() calls in
load_time_data.js. You might have to build in debug to test this (?).

[Mike Lerman, 2014/08/20 15:58:16]

I was able to make this change, until I moved the visibility modified from JS to
CSS. How I get errors here, as you predicted.

+  }
+
 #if defined(OS_CHROMEOS)
   AddOptionsPageUIHandler(localized_strings,
                           new chromeos::options::AccountsOptionsHandler());
   AddOptionsPageUIHandler(localized_strings,
                           new chromeos::options::BluetoothOptionsHandler());
   AddOptionsPageUIHandler(localized_strings,
                           new chromeos::options::DateTimeOptionsHandler());
   AddOptionsPageUIHandler(localized_strings,
                           new chromeos::options::DisplayOptionsHandler());
   AddOptionsPageUIHandler(localized_strings,
@@ skipping 151 matching lines @@
   // Add only if handler's service is enabled.
   if (handler->IsEnabled()) {
     // Add handler to the list and also pass the ownership.
     web_ui()->AddMessageHandler(handler.release());
     handler_raw->GetLocalizedValues(localized_strings);
     handlers_.push_back(handler_raw);
   }
 }
 
 }  // namespace options