diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index 2c8ab3d..f32da9a 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -5,12 +5,11 @@
  * Preprocessors and helper functions to make theming easier.
  */
 
+use Drupal\Component\Utility\Html;
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Component\Utility\String;
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Template\Attribute;
-use Drupal\views\Form\ViewsForm;
-use Drupal\views\ViewExecutable;
 
 /**
  * Prepares variables for view templates.
@@ -25,14 +24,14 @@ function template_preprocess_views_view(&$variables) {
   $view = $variables['view'];
   $id = $view->storage->id();
 
-  $variables['css_name'] = drupal_clean_css_identifier($id);
+  $variables['css_name'] = Html::cleanCssIdentifier($id);
   $variables['id'] = $id;
   $variables['display_id'] = $view->current_display;
 
   // Basic classes.
   $variables['attributes']['class'] = array();
   $variables['attributes']['class'][] = 'view';
-  $variables['attributes']['class'][] = 'view-' . drupal_clean_css_identifier($variables['id']);
+  $variables['attributes']['class'][] = 'view-' . Html::cleanCssIdentifier($variables['id']);
   $variables['attributes']['class'][] = 'view-id-' . $variables['id'];
   $variables['attributes']['class'][] = 'view-display-id-' . $variables['display_id'];