components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/sync/profile_signin_confirmation_helper_unittest.cc

Index: chrome/browser/ui/sync/profile_signin_confirmation_helper_unittest.cc
diff --git a/chrome/browser/ui/sync/profile_signin_confirmation_helper_unittest.cc b/chrome/browser/ui/sync/profile_signin_confirmation_helper_unittest.cc
index da4850eca8e5f93a58fc358cabec08a7d38fe84b..2117b99aff699cb649f8a21e141e08613a6d727b 100644
--- a/chrome/browser/ui/sync/profile_signin_confirmation_helper_unittest.cc
+++ b/chrome/browser/ui/sync/profile_signin_confirmation_helper_unittest.cc
@@ -129,7 +129,7 @@ class ProfileSigninConfirmationHelperTest : public testing::Test {
         new TestingPrefStore(),
         user_prefs_,
         new TestingPrefStore(),
-        new PrefRegistrySyncable(),
+        new user_prefs::PrefRegistrySyncable(),
         new PrefNotifierImpl());
     chrome::RegisterUserPrefs(pref_service->registry());
     builder.SetPrefService(make_scoped_ptr<PrefServiceSyncable>(pref_service));