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When a user command-clicks on a nested bookmark bar folder to open all,
we pop up a dialog to ask if they're sure if the number of tabs that
would be opened exceeds some minimum. Currently, we do this *before*
we dismiss the menu, which (at least on the Mac) closes on a later run
loop as the result of a focus change.

This causes some issues on Mac, including a mouse capture induced
crash and accessibility inconsistencies (see bug for both).

This change disables the code that keeps the bookmark menu open on
background open if the node is a folder.

Bug: 1105587
Change-Id: Iba0ffb0746a9caab0484df22ab40f49ef554ff2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299530
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789490}