sync: Use base::MessageLoop.

sync/tools/sync_listen_notifications.cc

Index: sync/tools/sync_listen_notifications.cc
diff --git a/sync/tools/sync_listen_notifications.cc b/sync/tools/sync_listen_notifications.cc
index 7a0624a0ec6676a7fbf6c87b59382a59628c7629..92fde0ea05474c6cf6d38e737c9c03fb5c5f743e 100644
--- a/sync/tools/sync_listen_notifications.cc
+++ b/sync/tools/sync_listen_notifications.cc
@@ -157,10 +157,10 @@ int SyncListenNotificationsMain(int argc, char* argv[]) {
       logging::DELETE_OLD_LOG_FILE,
       logging::DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS);
 
-  MessageLoop ui_loop;
+  base::MessageLoop ui_loop;
   base::Thread io_thread("IO thread");
   base::Thread::Options options;
-  options.message_loop_type = MessageLoop::TYPE_IO;
+  options.message_loop_type = base::MessageLoop::TYPE_IO;
   io_thread.StartWithOptions(options);
 
   // Parse command line.