Issue #3097444 by longwave: Remove color.module BC layers

core/modules/color/color.module

@@ -119,19 +119,6 @@ function color_block_view_system_branding_block_alter(array &$build, BlockPlugin
   $build['#pre_render'][] = [ColorSystemBrandingBlockAlter::class, 'preRender'];
 }
 
-/**
- * #pre_render callback: Sets color preset logo.
- *
- * @deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use
- *   \Drupal\color\ColorSystemBrandingBlockAlter::preRender() instead.
- *
- * @see https://www.drupal.org/node/2966725
- */
-function color_block_view_pre_render(array $build) {
-  @trigger_error('color_block_view_pre_render() is deprecated in Drupal 8.8.0 and will be removed before Drupal 9.0.0. Use \Drupal\color\ColorSystemBrandingBlockAlter::preRender() instead. See https://www.drupal.org/node/2966725', E_USER_DEPRECATED);
-  return ColorSystemBrandingBlockAlter::preRender($build);
-}
-
 /**
  * Retrieves the Color module information for a particular theme.
  */

core/modules/color/tests/src/Kernel/ColorLegacyTest.php

-<?php
-
-namespace Drupal\Tests\color\Kernel;
-
-use Drupal\KernelTests\KernelTestBase;
-
-/**
- * Tests Color module's legacy code.
- *
- * @group color
- * @group legacy
- */
-class ColorLegacyTest extends KernelTestBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  protected static $modules = ['system', 'color'];
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-
-    $this->container->get('theme_installer')->install(['bartik']);
-    $this->config('system.theme')
-      ->set('default', 'bartik')
-      ->save();
-  }
-
-  /**
-   * Tests color_block_view_pre_render() deprecation.
-   *
-   * @expectedDeprecation color_block_view_pre_render() is deprecated in Drupal 8.8.0 and will be removed before Drupal 9.0.0. Use \Drupal\color\ColorSystemBrandingBlockAlter::preRender() instead. See https://www.drupal.org/node/2966725
-   */
-  public function testColorSystemBrandingBlockAlterPreRender() {
-    $render = color_block_view_pre_render([]);
-    $this->assertEquals(['config:color.theme.bartik'], $render['#cache']['tags']);
-  }
-
-}