Major updates to the echo removal functionality in AEC3

webrtc/modules/audio_processing/aec3/subtractor_output.h

 /*
  *  Copyright (c) 2017 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.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_OUTPUT_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_OUTPUT_H_
 
 #include <array>
 
 #include "webrtc/modules/audio_processing/aec3/aec3_common.h"
 #include "webrtc/modules/audio_processing/aec3/fft_data.h"
 
 namespace webrtc {
 
 // Stores the values being returned from the echo subtractor.
 struct SubtractorOutput {
   std::array<float, kBlockSize> e_main;
   std::array<float, kBlockSize> e_shadow;
   FftData E_main;
-  FftData E_shadow;
   std::array<float, kFftLengthBy2Plus1> E2_main;
   std::array<float, kFftLengthBy2Plus1> E2_shadow;
 
   void Reset() {
     e_main.fill(0.f);
     e_shadow.fill(0.f);
     E_main.re.fill(0.f);
     E_main.im.fill(0.f);
-    E_shadow.re.fill(0.f);
-    E_shadow.im.fill(0.f);
     E2_main.fill(0.f);
     E2_shadow.fill(0.f);
   }
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_OUTPUT_H_