[HttpKernel] made some minor tweaks

src/Symfony/Component/HttpKernel/Client.php

@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\HttpKernel;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\BrowserKit\Client as BaseClient;

src/Symfony/Component/HttpKernel/HttpKernelInterface.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpKernel;
 
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 
 /**
  * HttpKernelInterface handles a Request to convert it to a Response.