Move VoiceEngineObserver into AudioSendStream so that we detect typing noises and return properly i…

webrtc/audio/webrtc_audio.gypi

Index: webrtc/audio/webrtc_audio.gypi
diff --git a/webrtc/audio/webrtc_audio.gypi b/webrtc/audio/webrtc_audio.gypi
index b9d45db56db9af5e96a14d396425d64ae0ded93a..4fa8231eeeed5850fd558d8ad65d5fa471bb4edc 100644
--- a/webrtc/audio/webrtc_audio.gypi
+++ b/webrtc/audio/webrtc_audio.gypi
@@ -20,6 +20,10 @@
       'audio/audio_send_stream.h',
       'audio/conversion.h',
       'audio/scoped_voe_interface.h',
+      'audio/typing_noise_observer.cc',
+      'audio/typing_noise_observer.h',
+      'audio/voice_engines.cc',
+      'audio/voice_engines.h',
     ],
   },
 }