wp-admin/custom-header.php

<?php
/**
 * Custom header image script.
 *
 * This file is deprecated, use 'wp-admin/includes/class-custom-image-header.php' instead.
 *
 * @deprecated 5.3.0
 * @package WordPress
 * @subpackage Administration
 */

_deprecated_file( basename( __FILE__ ), '5.3.0', 'wp-admin/includes/class-custom-image-header.php' );

/** Custom_Image_Header class */
require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';