components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/policy/url_blacklist_manager.cc

Index: chrome/browser/policy/url_blacklist_manager.cc
diff --git a/chrome/browser/policy/url_blacklist_manager.cc b/chrome/browser/policy/url_blacklist_manager.cc
index 998cb49ea2e1bb3491176bca270961784a816753..d7d768f1b95108aae0bd09ef01bf76664d630713 100644
--- a/chrome/browser/policy/url_blacklist_manager.cc
+++ b/chrome/browser/policy/url_blacklist_manager.cc
@@ -399,11 +399,12 @@ bool URLBlacklistManager::IsRequestBlocked(
 }
 
 // static
-void URLBlacklistManager::RegisterUserPrefs(PrefRegistrySyncable* registry) {
+void URLBlacklistManager::RegisterUserPrefs(
+    user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterListPref(prefs::kUrlBlacklist,
-                             PrefRegistrySyncable::UNSYNCABLE_PREF);
+                             user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterListPref(prefs::kUrlWhitelist,
-                             PrefRegistrySyncable::UNSYNCABLE_PREF);
+                             user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 }  // namespace policy