[HttpKernel] fixed CS
Merge branch '2.3' into 2.4

* 2.3:
  [HttpFoundation] removed test file not related to 2.3
  [HttpKernel] fixed CS
  Add tests for RequestStack class
Merge branch '2.4'

* 2.4:
  Revert "[HttpFoundation] removed test file not related to 2.3"
  [HttpFoundation] removed test file not related to 2.3
  [HttpKernel] fixed CS
  Add tests for RequestStack class