Major updates to the echo removal functionality in AEC3

webrtc/modules/audio_processing/aec3/subtractor_output.h

Index: webrtc/modules/audio_processing/aec3/subtractor_output.h
diff --git a/webrtc/modules/audio_processing/aec3/subtractor_output.h b/webrtc/modules/audio_processing/aec3/subtractor_output.h
index 90b9065b3bdf4d1efee81030700126e96341b44a..e2d23b5440f750aa4f31bcf2b99b22415ed736cc 100644
--- a/webrtc/modules/audio_processing/aec3/subtractor_output.h
+++ b/webrtc/modules/audio_processing/aec3/subtractor_output.h
@@ -23,7 +23,6 @@ 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;
 
@@ -32,8 +31,6 @@ struct SubtractorOutput {
     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);
   }