example/audio: delete obsolete TODO.
example/audio: delete obsolete TODO.

Change-Id: I6245a48a45fd1631550bb4102734a41e06fafcba
Reviewed-on: https://go-review.googlesource.com/11471
Reviewed-by: Burcu Dogan <347c19a639ce752a783b4ea325d6539ab4b4a262@google.com>

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