6 files declare their use of ContentSyncManagerInterface in Content Synchronization 8.2

ContentExportForm.php in src/Form/ContentExportForm.php

ContentExportMultiple.php in src/Form/ContentExportMultiple.php

ContentExportTrait.php in src/Form/ContentExportTrait.php

ContentImportTrait.php in src/Form/ContentImportTrait.php

ContentSync.php in src/Form/ContentSync.php

ContentSyncCommands.php in src/Commands/ContentSyncCommands.php