diff --git a/core/lib/Drupal/Core/Asset/AssetResolver.php b/core/lib/Drupal/Core/Asset/AssetResolver.php
index bc8f69f..7d959d4 100644
--- a/core/lib/Drupal/Core/Asset/AssetResolver.php
+++ b/core/lib/Drupal/Core/Asset/AssetResolver.php
@@ -137,15 +137,6 @@ public function getCssAssets(AttachedAssetsInterface $assets, $optimize) {
     // Sort CSS items, so that they appear in the correct order.
     uasort($css, 'static::sort');
 
-    // Allow themes to remove CSS files by CSS files full path and file name.
-    if ($stylesheet_remove = $theme_info->getStyleSheetsRemove()) {
-      foreach ($css as $key => $options) {
-        if (isset($stylesheet_remove[$key])) {
-          unset($css[$key]);
-        }
-      }
-    }
-
     if ($optimize) {
       $css = \Drupal::service('asset.css.collection_optimizer')->optimize($css);
     }
diff --git a/core/lib/Drupal/Core/Theme/ActiveTheme.php b/core/lib/Drupal/Core/Theme/ActiveTheme.php
index d1970e7..a282434 100644
--- a/core/lib/Drupal/Core/Theme/ActiveTheme.php
+++ b/core/lib/Drupal/Core/Theme/ActiveTheme.php
@@ -60,13 +60,6 @@ class ActiveTheme {
   protected $extension;
 
   /**
-   * The stylesheets which are set to be removed by the theme.
-   *
-   * @var array
-   */
-  protected $styleSheetsRemove;
-
-  /**
    * The libraries provided by the theme.
    *
    * @var array
@@ -91,7 +84,6 @@ public function __construct(array $values) {
       'path' => '',
       'engine' => 'twig',
       'owner' => 'twig',
-      'stylesheets_remove' => [],
       'libraries' => [],
       'extension' => 'html.twig',
       'base_themes' => [],
@@ -102,7 +94,6 @@ public function __construct(array $values) {
     $this->path = $values['path'];
     $this->engine = $values['engine'];
     $this->owner = $values['owner'];
-    $this->styleSheetsRemove = $values['stylesheets_remove'];
     $this->libraries = $values['libraries'];
     $this->extension = $values['extension'];
     $this->baseThemes = $values['base_themes'];
@@ -166,15 +157,6 @@ public function getLibraries() {
   }
 
   /**
-   * Returns the removed stylesheets by the theme.
-   *
-   * @return mixed
-   */
-  public function getStyleSheetsRemove() {
-    return $this->styleSheetsRemove;
-  }
-
-  /**
    * Returns an array of base theme active theme objects keyed by name.
    *
    * The order starts with the base theme of $this and ends with the root of
diff --git a/core/lib/Drupal/Core/Theme/ThemeInitialization.php b/core/lib/Drupal/Core/Theme/ThemeInitialization.php
index 6697d9b..7231610 100644
--- a/core/lib/Drupal/Core/Theme/ThemeInitialization.php
+++ b/core/lib/Drupal/Core/Theme/ThemeInitialization.php
@@ -161,31 +161,9 @@ public function getActiveTheme(Extension $theme, array $base_themes = []) {
     $values['path'] = $theme_path;
     $values['name'] = $theme->getName();
 
-    // Prepare stylesheets from this theme as well as all ancestor themes.
-    // We work it this way so that we can have child themes remove CSS files
-    // easily from parent.
-    $values['stylesheets_remove'] = array();
-
-    // Grab stylesheets from base theme.
-    foreach ($base_themes as $base) {
-      $base_theme_path = $base->getPath();
-      if (!empty($base->info['stylesheets-remove'])) {
-        foreach ($base->info['stylesheets-remove'] as $css_file) {
-          $css_file = $this->resolveStyleSheetPlaceholders($css_file);
-          $values['stylesheets_remove'][$css_file] = $css_file;
-        }
-      }
-    }
-
-    // Add stylesheets used by this theme.
-    if (!empty($theme->info['stylesheets-remove'])) {
-      foreach ($theme->info['stylesheets-remove'] as $css_file) {
-        $css_file = $this->resolveStyleSheetPlaceholders($css_file);
-        $values['stylesheets_remove'][$css_file] = $css_file;
-      }
-    }
-
     // Prepare libraries overrides from this theme and ancestor themes.
+    // This allows child themes to easily remove CSS files from base themes and
+    // modules.
     $values['libraries_override'] = array();
 
     // Grab libraries-overrides from base theme.
diff --git a/core/modules/system/src/Tests/Theme/ThemeInfoTest.php b/core/modules/system/src/Tests/Theme/ThemeInfoTest.php
index 3d376ed..bc3acc9 100644
--- a/core/modules/system/src/Tests/Theme/ThemeInfoTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeInfoTest.php
@@ -56,7 +56,7 @@ protected function setUp() {
   }
 
   /**
-   * Tests stylesheets-remove.
+   * Tests stylesheets removed by libraries-override.
    */
   function testStylesheets() {
     $this->themeHandler->install(array('test_basetheme', 'test_subtheme'));
diff --git a/core/modules/system/tests/themes/test_basetheme/test_basetheme.info.yml b/core/modules/system/tests/themes/test_basetheme/test_basetheme.info.yml
index dcb1a2f..d545822 100644
--- a/core/modules/system/tests/themes/test_basetheme/test_basetheme.info.yml
+++ b/core/modules/system/tests/themes/test_basetheme/test_basetheme.info.yml
@@ -5,5 +5,5 @@ version: VERSION
 core: 8.x
 libraries:
   - test_basetheme/global-styling
-stylesheets-remove:
-  - '@theme_test/css/base-remove.css'
+libraries-override:
+  theme_test/theme_stylesheets_override_and_remove_test/css/base/css/base-remove.css: false
diff --git a/core/modules/system/tests/themes/test_subtheme/test_subtheme.info.yml b/core/modules/system/tests/themes/test_subtheme/test_subtheme.info.yml
index 6883e5a..bd6a625 100644
--- a/core/modules/system/tests/themes/test_subtheme/test_subtheme.info.yml
+++ b/core/modules/system/tests/themes/test_subtheme/test_subtheme.info.yml
@@ -6,6 +6,6 @@ core: 8.x
 base theme: test_basetheme
 libraries:
   - test_subtheme/global-styling
-stylesheets-remove:
-  - '@theme_test/css/sub-remove.css'
-  - '@test_basetheme/base-add.sub-remove.css'
+libraries-override:
+  theme_test/theme_stylesheets_override_and_remove_test/css/base/css/sub-remove.css: false
+  test_basetheme/global-styling/css/base/base-add.sub-remove.css: false
diff --git a/core/modules/system/tests/themes/test_theme/test_theme.info.yml b/core/modules/system/tests/themes/test_theme/test_theme.info.yml
index d81c4e3..9e63615 100644
--- a/core/modules/system/tests/themes/test_theme/test_theme.info.yml
+++ b/core/modules/system/tests/themes/test_theme/test_theme.info.yml
@@ -14,19 +14,18 @@ description: 'Theme for testing the theme system'
 version: VERSION
 base theme: classy
 core: 8.x
-stylesheets-remove:
-  - '@system/css/system.module.css'
-regions:
-  content: Content
-  left: Left
-  right: Right
-
 libraries-override:
+  system/base/css/component/css/system.module.css: false
   # Replace an entire library.
-  core/drupal.collapse: 'test_theme/collapse'
+  core/drupal.collapse: test_theme/collapse
   # Remove an entire library.
-  core/drupal.progress: FALSE
+  core/drupal.progress: false
   # Replace one particular library asset with another.
-  classy/base/css/theme/css/layout.css: 'css/test_theme_layout.css'
+  classy/base/css/theme/css/layout.css: css/test_theme_layout.css
   # Remove one particular asset.
-  core/drupal.dialog/css/theme/misc/dialog.theme.css: FALSE
+  core/drupal.dialog/css/theme/misc/dialog.theme.css: false
+regions:
+  content: Content
+  left: Left
+  right: Right
+
diff --git a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
index 4a9101d..3fe4054 100644
--- a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
+++ b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
@@ -92,8 +92,7 @@ public function testGetRegistryForModule() {
       'path' => 'core/modules/system/tests/themes/test_theme/test_theme.info.yml',
       'engine' => 'twig',
       'owner' => 'twig',
-      'stylesheets_remove' => [],
-      'stylesheets_override' => [],
+      'libraries_override' => [],
       'libraries' => [],
       'extension' => '.twig',
       'base_themes' => [],
diff --git a/core/themes/seven/seven.info.yml b/core/themes/seven/seven.info.yml
index 99a3ec1..daf74a0 100644
--- a/core/themes/seven/seven.info.yml
+++ b/core/themes/seven/seven.info.yml
@@ -8,9 +8,9 @@ version: VERSION
 core: 8.x
 libraries:
  - seven/global-styling
-stylesheets-remove:
-  - core/assets/vendor/jquery.ui/themes/base/dialog.css
-  - '@classy/css/layout.css'
+libraries-override:
+  core/jquery.ui.dialog/css/component/assets/vendor/jquery.ui/themes/base/dialog.css: false
+  classy/base/css/theme/css/layout.css: false
 quickedit_stylesheets:
   - css/components/quickedit.css
 regions:
diff --git a/core/themes/stark/stark.info.yml b/core/themes/stark/stark.info.yml
index bd520f5..48df350 100644
--- a/core/themes/stark/stark.info.yml
+++ b/core/themes/stark/stark.info.yml
@@ -6,5 +6,5 @@ version: VERSION
 core: 8.x
 libraries:
   - stark/global-styling
-stylesheets-remove:
-  - core/assets/vendor/normalize-css/normalize.css
+libraries-override:
+  core/normalize/css/base/assets/vendor/normalize-css/normalize.css: false