Remove last uses of the enumerate_files script. BUG=angleproject:981 Change-Id: Ib91d4b515e129241814706351b69a74e8295a250 Reviewed-on: https://chromium-review.googlesource.com/266874 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>