The previous patch edited the generated file manually. Fix the script
to generate the file so that angle_white_box_tests pass.

BUG=angleproject:2300
TEST=angle_white_box_tests

Change-Id: Ie8f182b515721a56d6a2da2dac316aa4e296f005
Reviewed-on: https://chromium-review.googlesource.com/870113Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>