Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/ui/webui/ntp/android/promo_handler.cc

Index: chrome/browser/ui/webui/ntp/android/promo_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/android/promo_handler.cc b/chrome/browser/ui/webui/ntp/android/promo_handler.cc
index d67dbc305c7be34337854160b933f9fff9e1e0f4..104d225e7b20304780cec009eb96111968c8a860 100644
--- a/chrome/browser/ui/webui/ntp/android/promo_handler.cc
+++ b/chrome/browser/ui/webui/ntp/android/promo_handler.cc
@@ -121,10 +121,10 @@ void PromoHandler::RegisterMessages() {
 }
 
 // static
-void PromoHandler::RegisterUserPrefs(PrefService* prefs) {
+void PromoHandler::RegisterUserPrefs(PrefServiceSyncable* prefs) {
   prefs->RegisterBooleanPref(prefs::kNtpPromoDesktopSessionFound,
                              false,
-                             PrefService::UNSYNCABLE_PREF);
+                             PrefServiceSyncable::UNSYNCABLE_PREF);
 }
 
 void PromoHandler::Observe(int type,