Restore image toolkit settings on uninstall.

    variable_set('file_public_schema', $public_schema);

  }

  // Delete variables.

  variable_del('brandfolder_default_brandfolder');

  variable_del('brandfolder_default_collection');

  variable_del('brandfolder_guest_api_key');

  // Restore the image toolkit selection to its pre-Brandfolder state as

  // well as possible.

  $current_image_toolkit = variable_get('image_toolkit', FALSE);

  $fallback_image_toolkit = variable_get('brandfolder_image_toolkit_fallback', FALSE);

  if ($current_image_toolkit === 'brandfolder') {

    if ($fallback_image_toolkit && $fallback_image_toolkit != 'brandfolder') {

      variable_set('image_toolkit', $fallback_image_toolkit);

    }

  }

  variable_del('brandfolder_image_toolkit_fallback');

}