9 files declare their use of FileCacheFactory in Zircon Profile 8.0

DrupalKernel.php in core/lib/Drupal/Core/DrupalKernel.php

Contains \Drupal\Core\DrupalKernel.

ExtensionDiscovery.php in core/lib/Drupal/Core/Extension/ExtensionDiscovery.php

Contains \Drupal\Core\Extension\ExtensionDiscovery.

FileCacheFactoryTest.php in core/tests/Drupal/Tests/Component/FileCache/FileCacheFactoryTest.php

Contains \Drupal\Tests\Component\FileCache\FileCacheFactoryTest.

KernelTestBase.php in core/tests/Drupal/KernelTests/KernelTestBase.php

Contains \Drupal\KernelTests\KernelTestBase.

KernelTestBaseTest.php in core/tests/Drupal/KernelTests/KernelTestBaseTest.php

Contains \Drupal\KernelTests\KernelTestBaseTest.

UnitTestCase.php in core/tests/Drupal/Tests/UnitTestCase.php

Contains \Drupal\Tests\UnitTestCase.

WebTestBase.php in core/modules/simpletest/src/WebTestBase.php

Contains \Drupal\simpletest\WebTestBase.

YamlDiscovery.php in core/lib/Drupal/Component/Discovery/YamlDiscovery.php

Contains \Drupal\Component\Discovery\YamlDiscovery.

YamlFileLoader.php in core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php

Contains \Drupal\Core\DependencyInjection\YamlFileLoader.