Method removeExtensionFiles

/**
 * Removes this extension's files
 *
 * @return  void
 *
 * @since   4.0.0
 * @throws  \RuntimeException
 */
protected function removeExtensionFiles()
{
    // Remove the plugin files
    $this->parent->removeFiles($this->getManifest()->files, -1);
    // Remove all media and languages as well
    $this->parent->removeFiles($this->getManifest()->media);
    $this->parent->removeFiles($this->getManifest()->languages, 1);
}