Removed 2 protected methods from the class Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema

The methods processBaseTable() and processRevisionTable() are removed from the class Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema, becuase they are no longer used by Drupal core. THey where protected methods and therefore not part of the public API.

Removed:

protected function processBaseTable(ContentEntityTypeInterface $entity_type, array &$schema) {}

protected function processRevisionTable(ContentEntityTypeInterface $entity_type, array &$schema) {}