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-Most select elements have an associated text label to explain the
 element's purpose. To be in line with the overall Settings page
 a11y strategy, the labels will be marked as aria-hidden so
 ChromeVox navigation will skip over the label and navigate directly
 to the select element.

-This CL is primarily adding aria-hidden to the labels and in a few
 places correcting/adding the select element aria-label.

Fixed: 1015899
Change-Id: Ibc0a18498bdcdbba7bc3f824a24831a13716f372
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947194Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723486}