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At least on Windows, the screen reader will not read non-menu-item
Views in a menu. Currently, extensions hidden in the app menu and
the zoom plus and minus buttons are not read. This patch tags them as
kMenuItem, which fixes the bug.

Bug: 835738
Change-Id: I507c9595f6aa02d8768330f18a8b725ef1b440e4
Reviewed-on: https://chromium-review.googlesource.com/c/1354482Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612302}