Fix up Owner settings on first load
The session_manager has been mitigating some potential Owner settings
edge cases for quite some time, mostly around the user whitelist being
enabled without the owner on it! While these should all be gone, very
old devices being used for the first time could still run into
this. That said, Chrome's in a better position to handle this issue,
so let's move the functionality here.
BUG=chromium:422046
TEST=unit
Review URL: https://codereview.chromium.org/
985093002
Cr-Commit-Position: refs/heads/master@{#322402}