filter_dom_*() and _filter_htmlcorrector() have been replaced with Html utility class

The internal/private filter callback function _filter_htmlcorrector() of Filter module has been replaced with an Html utility class.

Drupal 7

$html = _filter_htmlcorrector($html);
$dom = filter_dom_load($html);
$html = filter_dom_serialize($dom);

Drupal 8

use Drupal\Component\Utility\Html;
$html = Html::normalize($html);
$dom = Html::load($html);
$html = Html::serialize($dom);