WP_Upgrader_Skin::header()

Source

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

public function header() {
		if ( $this->done_header ) {
			return;
		}
		$this->done_header = true;
		echo '<div class="wrap">';
		echo '<h1>' . $this->options['title'] . '</h1>';
	}