For some reason, this was giving a link error on Android.
Change it to use the mathutil version to be sure.

BUG=angleproject:1493
BUG=chromium:638323

Change-Id: I454ba4609d7818f50c668bb7c1a3b684f9ca8444
Reviewed-on: https://chromium-review.googlesource.com/381671Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>