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expose role description in AXPlatformNodeMac.

This ensures that screen reader users have context about what type of
button they are focused on when their focus moves to a bookmarks
button. This is particularly important when screen reader users move
by accessible pane to the bookmarks bar.

This CL also removes the message name IDS_ACCNAME_BOOKMARKS_MENU which
was no longer being used.

description of UI elements.

Bug: 1097760
Change-Id: If8d567bc349d21138fac83b19958aaf340803b09
AX-Relnotes: Give bookmarks buttons a role description and expose role
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605467Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#840207}