Add `hook_modules_uninstalled` to remove outdated permissions.

Closes #3356876

block_permissions.module

@@ -8,6 +8,7 @@
 use Drupal\Core\Render\Element;
 use Drupal\block\Entity\Block;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\user\Entity\Role;
 
 /**
  * Implements hook_form_FORM_ID_alter().
@@ -40,3 +41,19 @@ function block_permissions_form_block_admin_display_form_alter(&$form, FormState
     }
   }
 }
+
+/**
+ * Implements hook_modules_uninstalled().
+ */
+function block_permissions_modules_uninstalled($modules, $is_syncing) {
+  $roles = Role::loadMultiple();
+
+  foreach ($modules as $module) {
+    foreach ($roles as $role) {
+      if ($role->hasPermission('administer blocks provided by ' . $module)) {
+        $role->revokePermission('administer blocks provided by ' . $module);
+        $role->save();
+      }
+    }
+  }
+}