Reparent Nonlinear beamformer under beamforming interface.

R=aluebs@webrtc.org, andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/41269004

Cr-Original-Commit-Position: refs/heads/master@{#8862}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: dfa36058c945cf2ef9932a566987f648c24fa632
14 files changed