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Previously, each element in the barLabels div was its own navigation
stop. With this change, we read all of the barLabels div as one
navigation stop for the entire bar itself.

When navigated to via ChromeVox, it will now speak "Storage Usage
Overview, In use X GBs Available Y GBs, Progress indicator"


Bug: 1007602
Change-Id: Ia458e3c90470c707fcabb25e4750a2e77f00ac61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910720
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714738}