9 files declare their use of DefaultFacetManager in Facets 8

DefaultFacetsSummaryManager.php in modules/facets_summary/src/FacetsSummaryManager/DefaultFacetsSummaryManager.php

DependentFacetProcessor.php in src/Plugin/facets/processor/DependentFacetProcessor.php

DependentFacetProcessorTest.php in tests/src/Unit/Plugin/processor/DependentFacetProcessorTest.php

FacetBlock.php in src/Plugin/Block/FacetBlock.php

FacetForm.php in src/Form/FacetForm.php

FacetsSerializer.php in modules/facets_rest/src/Plugin/views/style/FacetsSerializer.php

FacetsSummaryForm.php in modules/facets_summary/src/Form/FacetsSummaryForm.php

FacetsSummarySettingsForm.php in modules/facets_summary/src/Form/FacetsSummarySettingsForm.php

SearchApiSubscriber.php in src/EventSubscriber/SearchApiSubscriber.php