Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/web_resource/notification_promo.h

Index: chrome/browser/web_resource/notification_promo.h
diff --git a/chrome/browser/web_resource/notification_promo.h b/chrome/browser/web_resource/notification_promo.h
index efe5bbd4d38272872dacf9bb27969e9ad4b763ff..f3b2c5bd8e17b406242cd270f7d4a2b998d32453 100644
--- a/chrome/browser/web_resource/notification_promo.h
+++ b/chrome/browser/web_resource/notification_promo.h
@@ -19,6 +19,7 @@ class ListValue;
 }
 
 class PrefService;
+class PrefServiceSyncable;
 class Profile;
 
 // Helper class for PromoResourceService that parses promo notification info
@@ -65,7 +66,7 @@ class NotificationPromo {
   }
 
   // Register preferences.
-  static void RegisterUserPrefs(PrefService* prefs);
+  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
 
  private:
   // For testing.