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When the sign-in promo view is hidden (by collapsing the "Other Devices" section), Chrome crashes,
if the sign-in promo view has to be reloaded (with a new identity added by another app for
example).
If the section is collapse the sign-in promo should not be updated. The view will be updated later
when the user will uncollapse the section.

Bug: 776939
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ie68ba68e40580b510a782b54ec744865311ed2bb
Reviewed-on: https://chromium-review.googlesource.com/811464
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522407}