8 files declare their use of FloodInterface

BasicAuth.php in core/modules/basic_auth/src/Authentication/Provider/BasicAuth.php
MessageForm.php in core/modules/contact/src/MessageForm.php
UserAuthenticationControllerTest.php in core/modules/user/tests/src/Kernel/Controller/UserAuthenticationControllerTest.php
UserController.php in core/modules/user/src/Controller/UserController.php
UserFloodControl.php in core/modules/user/src/UserFloodControl.php
UserFloodControlInterface.php in core/modules/user/src/UserFloodControlInterface.php
UserLoginFormTest.php in core/modules/user/tests/src/Kernel/Form/UserLoginFormTest.php
UserPasswordForm.php in core/modules/user/src/Form/UserPasswordForm.php

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