Fix for FIFO parameters calculation in WebRtcAudioRenderer::PrepareSink()
Fix for FIFO parameters calculation in WebRtcAudioRenderer::PrepareSink()

BUG=563560

Review URL: https://codereview.chromium.org/1489813002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362408}

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