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During Kiosk app launch we might need to configure network. This is
guarded by the owner authentication (in case of consumer kiosk). Before
this CL it used WebUI AccountPicker screen.
This CL moves it to the current User pod screen implementation

Bug: 1071779
Change-Id: Iaa1665e8d588d4df0beb5459365159a8292c08f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2540983
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829187}