Guest mode causes certain settings to be hidden.

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

Index: chrome/browser/ui/webui/options/options_ui.cc
diff --git a/chrome/browser/ui/webui/options/options_ui.cc b/chrome/browser/ui/webui/options/options_ui.cc
index de49ff1589312d27ff8d2bc65ee1474d16f1cfe2..f106bd0b3a191fa0861a64a83adfd00c9c8d3c00 100644
--- a/chrome/browser/ui/webui/options/options_ui.cc
+++ b/chrome/browser/ui/webui/options/options_ui.cc
@@ -294,7 +294,6 @@ OptionsUI::OptionsUI(content::WebUI* web_ui)
   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());
@@ -303,6 +302,12 @@ OptionsUI::OptionsUI(content::WebUI* web_ui)
   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());