components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/notifications/desktop_notification_service.cc

Index: chrome/browser/notifications/desktop_notification_service.cc
diff --git a/chrome/browser/notifications/desktop_notification_service.cc b/chrome/browser/notifications/desktop_notification_service.cc
index ab1589cb4bc9660ad21bf063013c8cd7c5d300a0..642e8c43ffa482bfb08957649fbd376a06e3900e 100644
--- a/chrome/browser/notifications/desktop_notification_service.cc
+++ b/chrome/browser/notifications/desktop_notification_service.cc
@@ -238,12 +238,12 @@ bool NotificationPermissionInfoBarDelegate::Cancel() {
 
 // static
 void DesktopNotificationService::RegisterUserPrefs(
-    PrefRegistrySyncable* registry) {
+    user_prefs::PrefRegistrySyncable* registry) {
 #if defined(OS_CHROMEOS) || defined(ENABLE_MESSAGE_CENTER)
   registry->RegisterListPref(prefs::kMessageCenterDisabledExtensionIds,
-                             PrefRegistrySyncable::SYNCABLE_PREF);
+                             user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterListPref(prefs::kMessageCenterDisabledSystemComponentIds,
-                             PrefRegistrySyncable::SYNCABLE_PREF);
+                             user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 #endif
 }