Issue #3097890 by martin107, longwave, andypost, lauriii: Remove all...

Issue #3097890 by martin107, longwave, andypost, lauriii: Remove all @deprecated code in core themes

core/themes/stable/stable.theme

@@ -27,9 +27,6 @@ function stable_library_info_alter(&$libraries, $extension) {
  * Implements template_preprocess_links().
  */
 function stable_preprocess_links(&$variables) {
-  // @deprecated in Drupal 8.0.x and will be removed before 9.0.0. This feature
-  // of adding a class based on the associative key can cause CSS class name
-  // conflicts.
   if (!empty($variables['links'])) {
     foreach ($variables['links'] as $key => $value) {
       if (!is_numeric($key)) {

core/themes/stark/css/layout.css

-/**
- * @file
- * Presentational styles for Drupal stark theme layout.
- *
- * It is left empty for testing purposes.
- *
- * @see https://www.drupal.org/project/drupal/issues/2349711
- */

core/themes/stark/stark.libraries.yml

-global-styling:
-  version: VERSION
-  css:
-    base:
-      css/layout.css: {}
-  deprecated: The "%library_id%" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/project/drupal/issues/2349711