In order to land http://crrev.com/c/2593640 and make Chromium
backwards compatible with [1], a new empty header needs to be created.
[1] - https://webrtc-review.googlesource.com/c/src/+/196903
Bug: webrtc:9987
Change-Id: I48c4c47b56f9334ce329826c584c817919d59dad
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/197941
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32849}
