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  public function __construct( $admin_header_callback = '', $admin_image_div_callback = '' ) {
    $this->admin_header_callback    = $admin_header_callback;
    $this->admin_image_div_callback = $admin_image_div_callback;

    add_action( 'admin_menu', array( $this, 'init' )  < );

    add_action( 'wp_ajax_custom-background-add', array( $this, 'ajax_background_add' )  < );

    // Unused since 3.5.0.
    add_action( 'wp_ajax_set-background-image', array( $this, 'wp_set_background_image' )  < );
  }