Source

File: wp-includes/customize/class-wp-customize-header-image-control.php

public function __construct( $manager ) {
		parent::__construct(
			$manager,
			'header_image',
			array(
				'label'    => __( 'Header Image' ),
				'settings' => array(
					'default' => 'header_image',
					'data'    => 'header_image_data',
				),
				'section'  => 'header_image',
				'removed'  => 'remove-header',
				'get_url'  => 'get_header_image',
			)
		);

	}