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When Talkback reads the media controls, it was reading both the name and
description of the control. For most of the controls, the name and
description were pretty similar, if not the same, so instead of getting
useful information, the user just gets the same thing said twice. this
change prevents this by return an empty string instead of the help string.

Bug: 560566
Change-Id: Id7c0fb95c779898a8bfe05d0d08fd42323098887
Reviewed-on: https://chromium-review.googlesource.com/c/1244583Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: CJ DiMeglio <lethalantidote@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596080}