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This both saves us the effort of updating the UI, and greatly reduces
the number of live region changed accessibility events sent for the
match count status area.

Bug: 1015818
Change-Id: I1a63d635fcb85f9f401a8fd3f065f4cf49be0d77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879433
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709545}