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This struct includes authenticated_account_id, which several bridges are
interested in. This is safer and simpler to use compared to reading
from side channels, and prevents a runtime dependency cycle across some
factories.

TBR=estade@chromium.org,rockot@chromium.org

Bug: 850428,834042,854446
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ib17a4503ff9d284e1a5f4e222e7eeb95b08a024f
Reviewed-on: https://chromium-review.googlesource.com/1111716
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570037}