This is unnecessary, and was breaking Linux builds because of
a conflict with features.h.

BUG=angle:773

Change-Id: Ic704ac24a0e8f5781f67cadca396bef779495efe
Reviewed-on: https://chromium-review.googlesource.com/232698Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>