GitLab

There was multi-platform fallout from making activation less aggressive
in r701411 so that when a session is restored on Mac with windows in
multiple spaces, the system won't switch spaces as those windows are
created and activated.

This rolls back all of the cross-platform changes from r701411 and
r710397, replacing them with behind one tweak to skip activating windows
after restoring their tabs, currently guarded to macOS-only.

Bug: 1019048, 1018885
Change-Id: Id45d2029cf8a5f2af08e7ec3aba911ff2b664a10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910282Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714657}