fixed typo
Merge branch '2.3'

* 2.3:
  fixed typo
[HttpKernel] Added a missing use statement.

Broken by #8572.
Merge branch '2.3'

* 2.3:
  [HttpKernel] Added a missing use statement.
  [Process] Increased the timeout in a test to prevent random failures when travis is under a heavy load.