diff -u b/core/profiles/demo_umami/themes/umami/umami.info.yml b/core/profiles/demo_umami/themes/umami/umami.info.yml
--- b/core/profiles/demo_umami/themes/umami/umami.info.yml
+++ b/core/profiles/demo_umami/themes/umami/umami.info.yml
@@ -12,12 +12,6 @@
   - umami/webfonts-scope-one
 
 libraries-override:
-  core/drupal.dialog: umami/classy.dialog
-  core/drupal.dropbutton: umami/classy.dropbutton
-  file/drupal.file: umami/classy.file
-  media/media_embed_ckeditor_theme: umami/classy.media_embed_ckeditor_theme
-  core/drupal.progress: umami/classy.progress
-  user/drupal.user: umami/classy.user
   layout_builder/twocol_section:
     css:
       theme:
diff -u b/core/tests/Drupal/KernelTests/Core/Theme/ConfirmClassyCopiesTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ConfirmClassyCopiesTest.php
--- b/core/tests/Drupal/KernelTests/Core/Theme/ConfirmClassyCopiesTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ConfirmClassyCopiesTest.php
@@ -548,7 +548,6 @@
             'form.css',
             'exposed-filters.css',
             'tabledrag.css',
-            'indented.css',
             'messages.css',
             'pager.css',
             'search-results.css',
diff -u b/core/themes/bartik/bartik.info.yml b/core/themes/bartik/bartik.info.yml
--- b/core/themes/bartik/bartik.info.yml
+++ b/core/themes/bartik/bartik.info.yml
@@ -22,12 +22,6 @@
   - bartik/classy.messages
   - core/normalize
   - bartik/global-styling
-libraries-override:
-  core/drupal.dialog: bartik/classy.dialog
-  core/drupal.dropbutton: bartik/classy.dropbutton
-  file/drupal.file: bartik/classy.file
-  media/media_embed_ckeditor_theme: bartik/classy.media_embed_ckeditor_theme
-  user/drupal.user: bartik/classy.user
 
 libraries-extend:
   core/drupal.dialog:
diff -u b/core/themes/claro/claro.info.yml b/core/themes/claro/claro.info.yml
--- b/core/themes/claro/claro.info.yml
+++ b/core/themes/claro/claro.info.yml
@@ -64,12 +64,6 @@
       component:
         assets/vendor/jquery.ui/themes/base/dialog.css: false
 
-  core/drupal.dialog: claro/claro.drupal.dialog
-
-  media/media_embed_ckeditor_theme: claro/classy.media_embed_ckeditor_theme
-
-  core/drupal.progress: claro/progress
-
   user/drupal.user: claro/form.password-confirm
 
   field_ui/drupal.field_ui:
diff -u b/core/themes/seven/seven.info.yml b/core/themes/seven/seven.info.yml
--- b/core/themes/seven/seven.info.yml
+++ b/core/themes/seven/seven.info.yml
@@ -42,12 +42,6 @@
     css:
       component:
         assets/vendor/jquery.ui/themes/base/dialog.css: false
-  core/drupal.dialog: seven/seven.drupal.dialog
-  core/drupal.dropbutton: seven/classy.dropbutton
-  file/drupal.file: seven/classy.file
-  media/media_embed_ckeditor_theme: seven/classy.media_embed_ckeditor_theme
-  core/drupal.progress: seven/classy.progress
-  user/drupal.user: seven/classy.user
 
 libraries-extend:
   core/ckeditor: