callOnDependencyRemoval example

// Try to fix the dependents and find out what will happen to the dependency     // graph. Entities are processed in the order of most dependent first. For     // example, this ensures that Menu UI third party dependencies on node types     // are fixed before processing the node type's other dependents.     while ($dependent = array_pop($dependents_to_process)) {
      /** @var \Drupal\Core\Config\Entity\ConfigEntityInterface $dependent */
      if ($dry_run) {
        // Clone the entity so any changes do not change any static caches.         $dependent = clone $dependent;
      }
      $fixed = FALSE;
      if ($this->callOnDependencyRemoval($dependent, $current_dependents, $type, $names)) {
        // Recalculate dependencies and update the dependency graph data.         $dependent->calculateDependencies();
        $dependency_manager->updateData($dependent->getConfigDependencyName(), $dependent->getDependencies());
        // Based on the updated data rebuild the list of current dependents.         // This will remove entities that are no longer dependent after the         // recalculation.         $current_dependents = $this->findConfigEntityDependenciesAsEntities($type, $names, $dependency_manager);
        // Rebuild the list of entities that we need to process using the new         // list of current dependents and removing any entities that we've         // already processed.         $dependents_to_process = array_filter($current_dependents, function D$current_dependent) use ($affected_uuids) {