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This change addresses two problems with parent access code
on login screen.
1. When doing reauth we should validate parent code against
all configurations that are available on device. We enforce
parent code when the device is owned by child, event if it
is different user going through reauth.
It will fix https://crbug.com/1140310.
2. IsDeviceOwnedByChild is causing a crash when the device
owner cannot be found on user list. While I cannot reproduce
such situation, it seems that either stored device owner id
is incorrect or we fail at reading users list from Local State.
Relaxing the owner check and defaulting to false will prevent
crash while we investigate the problem further.
It is a speculative fix for https://crbug.com/1140357.

Bug: 1140310, 1140357

Change-Id: I3d4afab92741d90cae768f58b0da831f0c6c163a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490855Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822273}