WP_Upgrader::__construct( WP_Upgrader_Skin $skin = null )

Source

File: wp-admin/includes/class-wp-upgrader.php

public function __construct( $skin = null ) {
		if ( null === $skin ) {
			$this->skin = new WP_Upgrader_Skin();
		} else {
			$this->skin = $skin;
		}
	}