This fixes a build break because of 046fa0ef.
See: https://crrev.com/c/898591

Bug: angleproject:2333
Change-Id: I6a4cb60dd2d2958ea71aaa27f1429233c2787fb4
Reviewed-on: https://chromium-review.googlesource.com/922878Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>