Remove unused NonlinearBeamformer interface

webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 403 matching lines @@
     float smoothed_mask = old_high_pass_mask_;
     for (size_t j = 0; j < data->num_frames_per_band(); ++j) {
       smoothed_mask += ramp_increment;
       for (size_t k = 0; k < num_postfilter_channels_; ++k) {
         data->channels(i)[k][j] *= smoothed_mask;
       }
     }
   }
 }
 
-void NonlinearBeamformer::ProcessChunk(const ChannelBuffer<float>& input,
-                                       ChannelBuffer<float>* output) {
-  RTC_DCHECK_GT(output->num_channels(), 0u);
-  RTC_DCHECK_EQ(output->num_frames_per_band(), input.num_frames_per_band());
-  AnalyzeChunk(input);
-  for (size_t i = 0u; i < input.num_bands(); ++i) {
-    std::memcpy(output->channels(i)[0], input.channels(i)[0],
-        sizeof(input.channels(0)[0][0]) * input.num_frames_per_band());
-  }
-  PostFilter(output);
-}
-
 void NonlinearBeamformer::AimAt(const SphericalPointf& target_direction) {
   target_angle_radians_ = target_direction.azimuth();
   InitHighFrequencyCorrectionRanges();
   InitInterfAngles();
   InitDelaySumMasks();
   InitTargetCovMats();
   InitInterfCovMats();
   NormalizeCovMats();
 }
 
@@ skipping 150 matching lines @@
                    new_mask_ + high_mean_end_bin_ + 1);
   if (new_mask_[quantile] > kMaskTargetThreshold) {
     is_target_present_ = true;
     interference_blocks_count_ = 0;
   } else {
     is_target_present_ = interference_blocks_count_++ < hold_target_blocks_;
   }
 }
 
 }  // namespace webrtc