7 files declare their use of Migration

D6NodeTranslation.php in core/modules/node/src/Plugin/migrate/D6NodeTranslation.php
D7NodeTranslation.php in core/modules/node/src/Plugin/migrate/D7NodeTranslation.php
FieldMigration.php in core/modules/migrate_drupal/src/Plugin/migrate/FieldMigration.php
FilterFormatPermissionTest.php in core/modules/filter/tests/src/Kernel/Migrate/d6/FilterFormatPermissionTest.php
MigrationPluginManagerTest.php in core/modules/migrate/tests/src/Unit/MigrationPluginManagerTest.php
MigrationTest.php in core/modules/migrate/tests/src/Unit/MigrationTest.php
Contains \Drupal\Tests\migrate\Unit\MigrationTest.
ProfileValues.php in core/modules/user/src/Plugin/migrate/ProfileValues.php

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