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This will be used to analyze how much entropy leaked by this API can be
used for cross-site tracking.

This cl does not address entropy leaked by voiceschanged events. Given
those events only occur when the list of voices changes due to a voice
being added or becoming unavailable, it is unlikely that they would be
useful to fingerprinting scripts.

Bug: 973801
Change-Id: Iaa2a43f942f2eb59cece362a571da3fe308e4831
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435738Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Chris Fredrickson <cfredric@google.com>
Cr-Commit-Position: refs/heads/master@{#812132}