MAGETWO-66048: Remove usages of unserialize in module Magento/Framework/App/Utility

Author: rganin

lib/internal/Magento/Framework/App/Utility/Files.php

@@ -407,7 +407,7 @@ public function getXmlCatalogFiles(
         $excludedFileNames = [],
         $asDataSet = true
     ) {
-        $cacheKey = __METHOD__ . '|' . json_encode('|', [$fileNamePattern, $excludedFileNames, $asDataSet]);
+        $cacheKey = __METHOD__ . '|' . json_encode([$fileNamePattern, $excludedFileNames, $asDataSet]);
         if (!isset(self::$_cache[$cacheKey])) {
             $files = $this->getFilesSubset(
                 $this->componentRegistrar->getPaths(ComponentRegistrar::MODULE),