Client says if it is confidential instead of repository

src/Repositories/ClientRepositoryInterface.php

@@ -25,15 +25,6 @@ interface ClientRepositoryInterface extends RepositoryInterface
      */
     public function getClientEntity($clientIdentifier);
 
-    /**
-     * Check if a client is confidential.
-     *
-     * @param string $clientIdentifier The client's identifier
-     *
-     * @return bool
-     */
-    public function isClientConfidential($clientIdentifier);
-
     /**
      * Validate a client's secret.
      *