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The underlying issue is that the kProfilesLastActive pref gets
cleared when Chrome is launched with a specific profile, which
prevents Chrome from iterating over the last active profiles
and calling session restore on each of them. This CL stops
clearing the pref when launched with --app-id, and avoids
restoring sessions for the last active profiles
if launched with --app-id. Also, ignore browser opens and
closes if the browser window is for a web app, in order to prevent
kProfilesLastActive pref from getting overwritten.

Bug: 1022795
Change-Id: I350a54eaaf167dabb297b9bda9061fe965f0750e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1984710Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827876}