Added url_field_widget_settings_form().

  return $info;

}

/**

 * Implements hook_field_widget_settings_form().

 */

function url_field_widget_settings_form($field, $instance) {

  $widget = $instance['widget'];

  $settings = $widget['settings'];

  $form['size'] = array(

    '#type' => 'textfield',

    '#title' => t('Size of URL field'),

    '#default_value' => $settings['size'],

    '#required' => TRUE,

    '#element_validate' => array('element_validate_integer_positive'),

  );

  return $form;

}

/**

 * Implements hook_field_widget_form().

 */