Remove unused operation method.

src/OperationListBuilder.php

@@ -78,9 +78,4 @@ class OperationListBuilder extends ConfigEntityListBuilder {
     ] + parent::buildRow($entity);
   }
 
-  public function getOperations(EntityInterface $entity) {
-    $operations = parent::getDefaultOperations($entity);
-    return $operations;
-  }
-
 }