components: Move PrefRegistrySyncable into user_prefs namespace.

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 f92eb1d4bef41c7a2b0abbef196d5cdba8a49568..bde22d65d4afca1f41ab957d27294c8b7aa8b2f7 100644
--- a/chrome/browser/web_resource/notification_promo.h
+++ b/chrome/browser/web_resource/notification_promo.h
@@ -13,14 +13,17 @@
 #include "base/memory/scoped_ptr.h"
 #include "googleurl/src/gurl.h"
 
+class PrefRegistrySimple;
+class PrefService;
+
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
-class PrefRegistrySimple;
-class PrefService;
+namespace user_prefs {
 class PrefRegistrySyncable;
+}
 
 // Helper class for PromoResourceService that parses promo notification info
 // from json or prefs.
@@ -67,7 +70,7 @@ class NotificationPromo {
 
   // Register preferences.
   static void RegisterPrefs(PrefRegistrySimple* registry);
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
   static void MigrateUserPrefs(PrefService* user_prefs);
 
  private: