Use full type names instead of auto for simple structs. BUG=angleproject:2107 Change-Id: I7a5e4be124ec4381799fea51de3715e09c2f7400 Reviewed-on: https://chromium-review.googlesource.com/957272 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>