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This ensures that the AnnounceTextView is purely an announcement and
cannot be navigated to by a screen reader.

reader.

Bug: 1161047, 1055150
Change-Id: I6ca8157261b2f8fc94978121807de008d59166d4
AX-Relnotes: Announcements in Views are not navigable to by a screen
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617220Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#842100}