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-Commit-Position: refs/heads/master@{#652834}
2 files changed