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This CL changes the logic to load the startup profile whenever the
profile picker should be loaded. It instead loads the guest profile
to indicate the picker should be open. This speeds up showing the picker
when the last profile used is heavy to load. The CL also unifies the
logic to decide whether to show the new picker (or the old user manager)
into one function, GetStartupProfile().

There is one behavioral difference: the new code directly opens browser
windows if the user had multiple profiles open last time. This is desired
because having multiple profiles open simultaneously the last time is a
strong signal the user wants to continue this way. Note that having
multiple profiles open the last time happens only in limited situations,
e.g. via chrome://restart or via session restore (when logging out /
switching off the machine with multiple profiles' windows open).

Bug: 1150330
Change-Id: Iae9744f44bc242e9aaaf8f287cc29e1089326786
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532460
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828665}