More speculative changes with goal to improve input audio support on Mac OSX
More speculative changes with goal to improve input audio support on Mac OSX

BUG=549021

Review URL: https://codereview.chromium.org/1551783002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368068}

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