8 files declare their use of QueryBase in Zircon Profile 8

ConditionAggregate.php in core/lib/Drupal/Core/Entity/Query/Sql/ConditionAggregate.php

Contains \Drupal\Core\Entity\Query\Sql\ConditionAggregate.

Query.php in core/lib/Drupal/Core/Config/Entity/Query/Query.php

Contains \Drupal\Core\Config\Entity\Query\Query.

Query.php in core/lib/Drupal/Core/Entity/KeyValueStore/Query/Query.php

Contains \Drupal\Core\Entity\KeyValueStore\Query\Query.

Query.php in core/lib/Drupal/Core/Entity/Query/Sql/Query.php

Contains \Drupal\Core\Entity\Query\Sql\Query.

Query.php in core/lib/Drupal/Core/Entity/Query/Null/Query.php

Contains \Drupal\Core\Entity\Query\Null\Query.

QueryFactory.php in core/lib/Drupal/Core/Config/Entity/Query/QueryFactory.php

Contains \Drupal\Core\Config\Entity\Query\QueryFactory.

QueryFactory.php in core/lib/Drupal/Core/Entity/Query/Sql/QueryFactory.php

Contains \Drupal\Core\Entity\Query\Sql\QueryFactory.

QueryFactory.php in core/lib/Drupal/Core/Entity/Query/Null/QueryFactory.php

Contains \Drupal\Core\Entity\Query\Null\QueryFactory.