6 files declare their use of ViewsBulkOperationsActionBase in Views Bulk Operations (VBO) 4.0.x

CancelUserAction.php in src/Plugin/Action/CancelUserAction.php

EntityDeleteAction.php in src/Plugin/Action/EntityDeleteAction.php

ViewsBulkOperationExampleAction.php in modules/views_bulk_operations_example/src/Plugin/Action/ViewsBulkOperationExampleAction.php

ViewsBulkOperationsAdvancedTestAction.php in tests/views_bulk_operations_test/src/Plugin/Action/ViewsBulkOperationsAdvancedTestAction.php

ViewsBulkOperationsPassTestAction.php in tests/views_bulk_operations_test/src/Plugin/Action/ViewsBulkOperationsPassTestAction.php

ViewsBulkOperationsSimpleTestAction.php in tests/views_bulk_operations_test/src/Plugin/Action/ViewsBulkOperationsSimpleTestAction.php