Featured_Content::register_setting PHP Method

        public static function register_setting()
        {
            add_settings_field('featured-content', __('Featured Content', 'jetpack'), array(__CLASS__, 'render_form'), 'reading');
            // Register sanitization callback for the Customizer.
            register_setting('featured-content', 'featured-content', array(__CLASS__, 'validate_settings'));
        }