The removal of these headers has been announced in November with
https://groups.google.com/forum/#!topic/discuss-webrtc/0vWBzJs0yDU.
Bug: webrtc:5883
Change-Id: I6ead2e3bd619472db1a78c0ded5dc57bdb66b76c
Reviewed-on: https://webrtc-review.googlesource.com/34648
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21512}