15 files declare their use of PublicStream in Zircon Profile 8

DummyRemoteStreamWrapper.php in core/modules/file/tests/file_test/src/StreamWrapper/DummyRemoteStreamWrapper.php

Contains \Drupal\file_test\StreamWrapper\DummyRemoteStreamWrapper.

file.inc in core/includes/file.inc

API for handling file uploads and server file management.

FileSystemForm.php in core/modules/system/src/Form/FileSystemForm.php

Contains \Drupal\system\Form\FileSystemForm.

FileTransferTest.php in core/modules/system/src/Tests/FileTransfer/FileTransferTest.php

Contains \Drupal\system\Tests\FileTransfer\FileTransferTest.

FilterHtmlImageSecureTest.php in core/modules/filter/src/Tests/FilterHtmlImageSecureTest.php

Contains \Drupal\filter\Tests\FilterHtmlImageSecureTest.

LocaleUpdateBase.php in core/modules/locale/src/Tests/LocaleUpdateBase.php

Contains \Drupal\locale\Tests\LocaleUpdateBase.

locale_test.module in core/modules/locale/tests/modules/locale_test/locale_test.module

Simulate a custom module with a local po file.

PhpStorageFactory.php in core/lib/Drupal/Core/PhpStorage/PhpStorageFactory.php

Contains \Drupal\Core\PhpStorage\PhpStorageFactory.

PhpStorageFactoryTest.php in core/modules/system/tests/src/Kernel/PhpStorage/PhpStorageFactoryTest.php

Contains \Drupal\system\Tests\PhpStorage\PhpStorageFactoryTest.

StreamWrapperTest.php in core/modules/system/src/Tests/File/StreamWrapperTest.php

Contains \Drupal\system\Tests\File\StreamWrapperTest.

system.install in core/modules/system/system.install

Install, update and uninstall functions for the system module.

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

Contains \Drupal\simpletest\TestBase.

ThemeSettingsForm.php in core/modules/system/src/Form/ThemeSettingsForm.php

Contains \Drupal\system\Form\ThemeSettingsForm.

ThemeTest.php in core/modules/system/src/Tests/System/ThemeTest.php

Contains \Drupal\system\Tests\System\ThemeTest.

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

Contains \Drupal\simpletest\WebTestBase.