Simplify formatutils9 by exposing the internal structures. BUG=angle:658 Change-Id: I8134cde4d72796c51613594e15aded86e83c4af7 Reviewed-on: https://chromium-review.googlesource.com/206837 Reviewed-by: Nicolas Capens <capn@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>