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Currently <cr-menu-item> don't have tabindex at all by default so it
can't be focused, making cr.ui.Menu.focusSelectedItem less useful.

Tabindex=-1 is focused only via JS not via Tab key, if a tabindex is
specified like tabindex=0 which receives focus via Tab key, this value
is preserved.

Bug: 889153
Change-Id: I32339c936ad01e67d1214bc2f721168ef24219d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1535319
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644643}