example/audio: move to events
example/audio: move to events

Change-Id: Ib6971e48abfa16b995d815ab37077c83940b9096
Reviewed-on: https://go-review.googlesource.com/12336
Reviewed-by: Hyang-Ah Hana Kim <d7e82c3c07f92613bcbf9a1e88f6b96c13caa3b0@gmail.com>

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