The lifetime of this list is fairly simple to reason about. There
is no need to allocate it into the zone.

R=leszeks@chromium.org

Change-Id: I9c918f7e5fddc24c943206aa82be859f27acc2fe
Reviewed-on: https://chromium-review.googlesource.com/c/1325610
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57359}