MDL-34047 repository URL downloader must say that it returns only images

repository/url/lib.php

@@ -151,6 +151,15 @@ EOD;
         }
     }
 
+    /**
+     * file types supported by url downloader plugin
+     *
+     * @return array
+     */
+    public function supported_filetypes() {
+        return array('web_image');
+    }
+
     public function supported_returntypes() {
         return (FILE_INTERNAL | FILE_EXTERNAL);
     }