replace legacy calls with new one

src/Wallabag/CoreBundle/Helper/Url.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Wallabag\CoreBundle\Helper;
+
+class Url
+{
+    public $url;
+
+    function __construct($url)
+    {
+        $this->url = base64_decode($url);
+    }
+
+    public function getUrl() {
+        return $this->url;
+    }
+
+    public function setUrl($url) {
+        $this->url = $url;
+    }
+
+    public function isCorrect() {
+        return filter_var($this->url, FILTER_VALIDATE_URL) !== FALSE;
+    }
+}