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Before we have the chance to fully implement the function, we need
a quick fix for (E)AC3.

No ATV we know of that supports (E)AC3 decoder, so it relies on the
audio sink device.

BUG=Internal b/36896359

Review-Url: https://codereview.chromium.org/2798263006
Cr-Commit-Position: refs/heads/master@{#463010}