Remove "multichannel" from parameter to match interface name.
Remove "multichannel" from parameter to match interface name.

TBR=mgraczyk@google.com

Review URL: https://codereview.webrtc.org/1250423004

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9635}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 7a1c24fce5d8cfaa56d548fe72b496a8c6e4e99e

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