Originally this change was based on change Ie5ff96a0c which handles
LOCK_FAILURE in PublicKeyStore#save, but since this change was rebased
out of the series the comments regarding LOCK_FAILURE are not correct
and should be dropped.
Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ic2406c1f32698dd9f1d725e09bff477fb7b606e3
942a39cd53