remove unnecessary variable

app/Http/Middleware/VerifyCsrfToken.php

@@ -6,13 +6,6 @@ use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as Middleware;
 
 class VerifyCsrfToken extends Middleware
 {
-    /**
-     * Indicates whether the XSRF-TOKEN cookie should be set on the response.
-     *
-     * @var bool
-     */
-    protected $addHttpCookie = true;
-
     /**
      * The URIs that should be excluded from CSRF verification.
      *