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Also removed the version updater callback argument as it does not need
to be created outside of CheckUpdates().

Bug: 1015841
Change-Id: I4a2bb4a23ce1c24e1a8358c641b797be0a79a21e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2049982
Commit-Queue: Andrey Zaytsev <andzaytsev@google.com>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743060}