[STG] Fix data duplications for shared tab groups on crash/power down.

When a window is created via TabRestore as the first tab restore
entry, the tabs in the window (and group) are not populated with
saved information if the browser had crashed or powered down in an
unclean state. This causes new groups to be created, even though they
should be mapped to saved groups.

This Cl adds methods that assign the correct saved information to the
tabs so they dont duplicate groups.

Fixed: 389107698
Change-Id: Ic6f387c533263def3102e35d013abf8c903feeee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6177194
Reviewed-by: Eshwar Stalin <estalin@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Commit-Queue: David Pennington <dpenning@chromium.org>
Reviewed-by: Darryl James <dljames@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1407984}