Add missing class property definitions

Author: rxu

notification/method/webpush.php

@@ -38,12 +38,21 @@ class webpush extends base implements extended_method_interface
 	/** @var log_interface */
 	protected $log;
 
+	/** @var user_loader */
+	protected $user_loader;
+
 	/** @var user */
 	protected $user;
 
 	/** @var path_helper */
 	protected $path_helper;
 
+	/** @var string */
+	protected $phpbb_root_path;
+
+	/** @var string */
+	protected $php_ext;
+
 	/** @var string Notification Web Push table */
 	protected $notification_webpush_table;