This is now updated in Chrome, so we can remove the last uses.

Bug: angleproject:2159
Change-Id: Ia31e42b8a685756ee70450be19a52248e3efa92f
Reviewed-on: https://chromium-review.googlesource.com/853119Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>