7 files declare their use of AccountCancellation

EntityResource.php in core/modules/jsonapi/src/Controller/EntityResource.php
user.module in core/modules/user/user.module
UserCancelForm.php in core/modules/user/src/Form/UserCancelForm.php
UserCancelMethodsConstraint.php in core/modules/user/src/Plugin/Validation/Constraint/UserCancelMethodsConstraint.php
UserController.php in core/modules/user/src/Controller/UserController.php
UserMultipleCancelConfirm.php in core/modules/user/src/Form/UserMultipleCancelConfirm.php
WorkspaceTest.php in core/modules/workspaces/tests/src/Functional/WorkspaceTest.php

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