Revert of - Clean up unused voice engine DTMF code.

webrtc/modules/audio_coding/test/TwoWayCommunication.cc

Index: webrtc/modules/audio_coding/test/TwoWayCommunication.cc
diff --git a/webrtc/modules/audio_coding/test/TwoWayCommunication.cc b/webrtc/modules/audio_coding/test/TwoWayCommunication.cc
index 161491b061064776bacd71a22ed193047a36c8ca..3ca7fd217d57592802f6f6ec38a940cf9676f152 100644
--- a/webrtc/modules/audio_coding/test/TwoWayCommunication.cc
+++ b/webrtc/modules/audio_coding/test/TwoWayCommunication.cc
@@ -50,6 +50,14 @@
   delete _channel_B2A;
   delete _channelRef_A2B;
   delete _channelRef_B2A;
+#ifdef WEBRTC_DTMF_DETECTION
+  if (_dtmfDetectorA != NULL) {
+    delete _dtmfDetectorA;
+  }
+  if (_dtmfDetectorB != NULL) {
+    delete _dtmfDetectorB;
+  }
+#endif
   _inFileA.Close();
   _inFileB.Close();
   _outFileA.Close();