7 files declare their use of LoginFinalizer

install.core.inc in core/includes/install.core.inc
API functions for installing Drupal.
LoginFinalizerTest.php in core/modules/user/tests/src/Kernel/LoginFinalizerTest.php
LogoutFinalizerTest.php in core/modules/user/tests/src/Kernel/LogoutFinalizerTest.php
user.module in core/modules/user/user.module
UserAuthenticationController.php in core/modules/user/src/Controller/UserAuthenticationController.php
UserController.php in core/modules/user/src/Controller/UserController.php
UserLoginForm.php in core/modules/user/src/Form/UserLoginForm.php

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