Switch guest profile from forced-incognito to UI mods like ChromeOS.

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

Index: chrome/browser/ui/webui/options/browser_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.cc b/chrome/browser/ui/webui/options/browser_options_handler.cc
index 5be4f546fee5583b6d09a5880da2d90686fcdcbf..315f9aeda367f8c8dd8b0b6f69aac0f43a71bd52 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.cc
+++ b/chrome/browser/ui/webui/options/browser_options_handler.cc
@@ -1573,10 +1573,9 @@ void BrowserOptionsHandler::SetupAccessibilityFeatures() {
 #endif
 
 void BrowserOptionsHandler::SetupMetricsReportingSettingVisibility() {
-#if defined(GOOGLE_CHROME_BUILD) && defined(OS_CHROMEOS)
+#if defined(GOOGLE_CHROME_BUILD)
   // Don't show the reporting setting if we are in the guest mode.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          chromeos::switches::kGuestSession)) {
+  if (Profile::FromWebUI(web_ui())->IsGuestSession()) {
     base::FundamentalValue visible(false);
     web_ui()->CallJavascriptFunction(
         "BrowserOptions.setMetricsReportingSettingVisibility", visible);