Corrected the behavior in AEC3 during buffer overruns and underruns

webrtc/modules/audio_processing/aec3/subtractor.cc

Index: webrtc/modules/audio_processing/aec3/subtractor.cc
diff --git a/webrtc/modules/audio_processing/aec3/subtractor.cc b/webrtc/modules/audio_processing/aec3/subtractor.cc
index 4b462238e2877a7159083a752b7bcd070cef279c..3897d947e1a39a00f02cbb6661296065c331d609 100644
--- a/webrtc/modules/audio_processing/aec3/subtractor.cc
+++ b/webrtc/modules/audio_processing/aec3/subtractor.cc
@@ -55,6 +55,7 @@ void Subtractor::HandleEchoPathChange(
     main_filter_.HandleEchoPathChange();
     shadow_filter_.HandleEchoPathChange();
     G_main_.HandleEchoPathChange();
+    G_shadow_.HandleEchoPathChange();
   }
 }