It only has one non-test caller, and that caller always passes in a
valid |use_stale| parameter. Update the unit tests to pass in the
parameter as well. After that, change it from an out parameter to the
return value.
Change-Id: Ia7862d74363b052c18ed9f37d4253c5f515f1d5f
Reviewed-on: https://chromium-review.googlesource.com/c/1456987
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630011}