This works around a limitation in UBSAN which can't handle decltype.
Instead use void * and typedef where appropriate.

BUG=chromium:692274

Change-Id: I4eab796db3aa2e51c0fc558170eb2af61f07223d
Reviewed-on: https://chromium-review.googlesource.com/443885Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>