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After https://chromium-review.googlesource.com/c/chromium/src/+/771196,
the interface MojoAudioInputIPC should conform to is slightly different
than originally expected. This CL updates it to fit the new interface.

Bug: 653871
Change-Id: Iea76d3033087742a93943fad94a8875c12459236
Reviewed-on: https://chromium-review.googlesource.com/806222
Commit-Queue: Max Morin <maxmorin@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524056}