7 files declare their use of DestinationBase in Drupal 8

BlockedIp.php in core/modules/ban/src/Plugin/migrate/destination/BlockedIp.php

Color.php in core/modules/color/src/Plugin/migrate/destination/Color.php

DummyDestination.php in core/modules/migrate/tests/modules/migrate_events_test/src/Plugin/migrate/destination/DummyDestination.php

NodeCounter.php in core/modules/statistics/src/Plugin/migrate/destination/NodeCounter.php

ShortcutSetUsers.php in core/modules/shortcut/src/Plugin/migrate/destination/ShortcutSetUsers.php

ThemeSettings.php in core/modules/system/src/Plugin/migrate/destination/d7/ThemeSettings.php

UserData.php in core/modules/user/src/Plugin/migrate/destination/UserData.php