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Update screen was renamed in http://crrev.com/c/2230462 in M85.
If device updates from <85 to >=85 version - pending update screen (from
local state) is not recognized. This makes Chromebooks start from the
welcome screen again.
Chromebases, Chromeboxes and Chromebits might actually suffer from the
white screen on M85 and M86. Users can't bypass the screen and have to
recover devices.
This CL handle this rename gracefully.

Fixed: 1160383
Change-Id: I1bc529791ef3072ce397cb85640416117ac85a94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600910Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839152}