The functions are validated later during graph generation.

This change uncovered a memory leak, which is now also fixed.

R=ahaas@chromium.org

Change-Id: I0150817da131c5c611fe21b156da9d9d00d4827d
Reviewed-on: https://chromium-review.googlesource.com/490088Reviewed-by: Andreas Rossberg <rossberg@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45086}