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These tests were using fake audio, but the issue is fixed and now
they can use real audio.

Bug: 1047655
Change-Id: Iedcc48f1fc19f8d5e4afd5ec04a90c991dae3e83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346348
Auto-Submit: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796419}