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Specifically, record a "launch_on_login" pref whenever lacros
successfully starts. Set the pref false when lacros terminates.

Prefs are flushed to disk periodically, so this means the pref is in
the right state even if ash-chrome crashes mid-session.

Bug: 1109050
Change-Id: If7ca21a570b73b56cbbef838cf59526034092b9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318648Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791968}