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This CL attempts to simplify a bit the the call to enable sync
from the native promos that are single account.

Bug: 1140978
Change-Id: Ie085da9775a3c81b9457b077ef283ca0b4f77576
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490107
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819831}