Remove method from future interface

The implementation is protected, so there is no reason to make it
public, is there?

Admin/AdminInterface.php

@@ -1072,12 +1072,4 @@ interface AdminInterface
      */
 //    NEXT_MAJOR: uncomment this method in 4.0
     // public function isDefaultFilter($name);
-
-    /*
-     * Returns a list of default filters.
-     *
-     * @return array
-     */
-//    NEXT_MAJOR: uncomment this method in 4.0
-    // public function getDefaultFilterValues();
 }