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Before this CL bluetooth device peripherals subtext where not being
vocalized by chromeVox, this CL adds subtext to vocalized string.

Bug: 1132975
Change-Id: Idabfe6abaf90f186c96d1b56952c911c7ba5fc53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472585
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818023}