Merge branch '4.3' into 4.4

* 4.3:
  [4.3] Cleanup tests
  Cleanup tests
  [Finder] Prevent unintentional file locks in Windows
  [FrameworkBundle] Fix about command not showing .env vars
  [DomCrawler] Fix FileFormField PHPDoc
  [Mailer] Remove the default dispatcher in AbstractTransport
  Fix #33395 PHP 5.3 compatibility

Author: nicolas-grekas

HttpBrowser.php

@@ -23,16 +23,14 @@
  * to make real HTTP requests.
  *
  * @author Fabien Potencier <fabien@symfony.com>
- *
- * @final
  */
 class HttpBrowser extends AbstractBrowser
 {
     private $client;
 
     public function __construct(HttpClientInterface $client = null, History $history = null, CookieJar $cookieJar = null)
     {
-        if (!class_exists(HttpClient::class)) {
+        if (!$client && !class_exists(HttpClient::class)) {
             throw new \LogicException(sprintf('You cannot use "%s" as the HttpClient component is not installed. Try running "composer require symfony/http-client".', __CLASS__));
         }