Use Symfony Request for core classes

Part of #1998638: [Meta] Refactor raw PHP variables (e.g $_SERVER, $_REQUEST, $_GET, $_POST) with Symfony Request object

Files needed to be changed are:

• core/lib/Drupal/Component/Utility/Crypt.php
• core/lib/Drupal/Core/Ajax/AjaxResponse.php
• core/lib/Drupal/Core/Controller/ExceptionController.php
• core/lib/Drupal/Core/Form/ConfirmFormBase.php
• core/lib/Drupal/Core/Mail/PhpMail.php
• core/lib/Drupal/Core/Utility/SchemaCache.php
• core/lib/Drupal/Core/Utility/ThemeRegistry.php