Remove unused NonlinearBeamformer interface

webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.h

Index: webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.h
diff --git a/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.h b/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.h
index 10ef6e5af62374f3a80cc44152ace5d3d1eace68..c9fd9953760003930d98ee83186313c91ba92bf9 100644
--- a/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.h
+++ b/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.h
@@ -78,10 +78,6 @@ class NonlinearBeamformer : public LappedTransform::Callback {
   // frames and channels must correspond to the constructor parameters.
   virtual void PostFilter(ChannelBuffer<float>* data);
 
-  // TODO(aluebs): Remove once the dependencies have moved to new API.
-  virtual void ProcessChunk(const ChannelBuffer<float>& input,
-                            ChannelBuffer<float>* output);
-
   virtual void AimAt(const SphericalPointf& target_direction);
 
   virtual bool IsInBeam(const SphericalPointf& spherical_point);