Use non-zero data in AudioRingBufferTest.
Use non-zero data in AudioRingBufferTest.

TBR=aluebs@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/35909004

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8176}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 922cfcd1500f62f76154957c99b9bf75d12a3e28

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