Avoid crash in FindAvailableSession when changing socket tag of alias.

Bug: 954503
Change-Id: Ie52549316bb71e476335f63e95c6c178245cdd4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575842
Auto-Submit: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#652834}(cherry picked from commit bc4db50ed61356fa569eafe9607456ae34676c2e)
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585078
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/branch-heads/3683@{#922}
Cr-Branched-From: e51029943e0a38dd794b73caaf6373d5496ae783-refs/heads/master@{#625896}
2 files changed