Fix accessibility issues of incognito window counter.

The accessible type of the menu is changed to kMenu. This fixes the
focus transfer issue of the screen readers.

Accessible name of the menu (and the profile menu) are updated so that
the screen readers won't call them just menu.

Bug: 896235
Change-Id: Icc79a1a394ecf71d5275511f2506ee8cdcc33cf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1581804
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654352}
4 files changed