Issue #3121085: Replace drupal_set_message() with messenger Service and drupal 9 compatability.

Closes #3121085

src/Form/TaxonomyImporterForm.php

@@ -8,7 +8,6 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\hierarchical_taxonomy_importer\services\ImporterService;
 use Drupal\taxonomy\Entity\Vocabulary;
-use Drupal\Core\Messenger\MessengerInterface;
 use Drupal\Core\File\FileSystemInterface;
 
 /**
@@ -23,13 +22,6 @@ class TaxonomyImporterForm extends FormBase {
    */
   protected $entityTypeManager;
 
-  /**
-   * The messenger service.
-   *
-   * @var \Drupal\Core\Messenger\MessengerInterface
-   */
-  protected $messenger;
-
   /**
    * The hierarchical taxonomy importer service.
    *
@@ -51,20 +43,16 @@ class TaxonomyImporterForm extends FormBase {
    *   The entity type manager.
    * @param \Drupal\hierarchical_taxonomy_importer\services\ImporterService $hierarchical_taxonomy_importer_importer
    *   The hierarchical taxonomy importer service.
-   * @param \Drupal\Core\Messenger\MessengerInterface $messenger
-   *   The messenger service.
    * @param \Drupal\Core\File\FileSystemInterface $file_system
    *   The file system service.
    */
   public function __construct(
     EntityTypeManagerInterface $entity_type_manager,
     ImporterService $hierarchical_taxonomy_importer_importer,
-    MessengerInterface $messenger,
     FileSystemInterface $file_system,
   ) {
     $this->entityTypeManager = $entity_type_manager;
     $this->hierarchicalTaxonomyImporter = $hierarchical_taxonomy_importer_importer;
-    $this->messenger = $messenger;
     $this->fileSystem = $file_system;
   }
 
@@ -75,7 +63,6 @@ class TaxonomyImporterForm extends FormBase {
     return new static(
       $container->get('entity_type.manager'),
       $container->get('hierarchical_taxonomy_importer.importer'),
-      $container->get('messenger'),
       $container->get('file_system')
     );
   }
@@ -162,14 +149,14 @@ class TaxonomyImporterForm extends FormBase {
 
       try {
         $this->hierarchicalTaxonomyImporter->import($vid, $output);
-        $this->messenger->addStatus($this->t('All terms have been imported successfully.'));
+        $this->messenger()->addStatus($this->t('All terms have been imported successfully.'));
       }
       catch (\Exception $e) {
-        $this->messenger->addError($this->t('An error occurred during import: @error', ['@error' => $e->getMessage()]));
+        $this->messenger()->addError($this->t('An error occurred during import: @error', ['@error' => $e->getMessage()]));
       }
     }
     else {
-      $this->messenger->addError($this->t('Could not open the CSV file for reading.'));
+      $this->messenger()->addError($this->t('Could not open the CSV file for reading.'));
     }
   }