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If the last active profile was deleted, a new browser was always opened.
After this CL, no browser is automatically opened if there is a profile
picker.

Note: if the last profile was deleted, a new profile is still created
and loaded in memory.

This CL also fixes a few instances where the wrong user manager was
opened (ProfilePicker opened instead of UserManager or vice-versa).

Fixed: 1121545
Change-Id: Ifbcd02ec1b1015a5736dd1714e36d5cf61d043da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2375211
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: Monica Basta <msalama@chromium.org>
Auto-Submit: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801923}