Fix DCHECK in account reconcilor when MultiLogin is enabled.

Bug:None

Change-Id: I8cb214541bacdae49e55cd87737fa8aa40ed1928
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1535881
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643357}