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This is a reland of f7713274

Original change's description:
> Fix session restore after launching with PWA.
>
> 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/+/1984710
> Reviewed-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}

Bug: 1022795
Change-Id: Ia09ddd04dcd853f8bc7322ecf7767580f3076ccf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546841
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831041}