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Finds the voice that best matches the app locale so that the default voice
is as close as possible to the app locale in the user's preferred language.

Bug: 823359
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I3374e2d38051cd7dbc089da2a9483887befc9fe4
Reviewed-on: https://chromium-review.googlesource.com/1067540Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561705}