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Chrome OS Account Manager has been enabled for 1% on Stable channel.
Enable it on ToT as preparation for 100% Stable ramp up.

TBR=droger@chromium.org

Bug: 816954
Change-Id: I6e0097237600e40c39a98e59af063deddd1da9a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761588Reviewed-by: Kush Sinha <sinhak@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689126}