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We did properly handle the case of losing network connection during
installation. We should close the network configure ui as soon as the
network appears to cover cases without an operator.

Bug: 1104169
Change-Id: Iee4cc7f342f417d51c152fd6d7ffa86e97affdf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302618Reviewed-by: Anqing Zhao <anqing@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790900}