Adding a check to not show sync promo for incognito profiles

chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc

Index: chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
diff --git a/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc b/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
index 93b4677f8b99360b7815e725c75445209bc5f360..bde0c6c5fe3a8afd0fd613b790f72ab3a04b3ad8 100644
--- a/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
+++ b/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
@@ -129,6 +129,10 @@ bool SyncPromoUI::ShouldShowSyncPromo(Profile* profile) {
   if (net::NetworkChangeNotifier::IsOffline())
     return false;
 
+  // Don't show if the profile is an incognito.
+  if (profile->IsOffTheRecord())
+    return false;
+
   // Display the signin promo if the user is not signed in.
   SigninManager* signin = SigninManagerFactory::GetForProfile(
       profile->GetOriginalProfile());