Make the destructor of AudioCodingModule public.

This allows the type to be used with a scoped_ptr. Remove all calls to
the deprecated Destroy() from tests.

R=turaj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2200006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4731 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/main/test/TestVADDTX.h b/webrtc/modules/audio_coding/main/test/TestVADDTX.h
index d1421ca..d55bdee 100644
--- a/webrtc/modules/audio_coding/main/test/TestVADDTX.h
+++ b/webrtc/modules/audio_coding/main/test/TestVADDTX.h
@@ -11,6 +11,7 @@
 #ifndef TEST_VAD_DTX_H
 #define TEST_VAD_DTX_H
 
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
 #include "ACMTest.h"
 #include "Channel.h"
 #include "PCMFile.h"
@@ -64,8 +65,8 @@
   void SetVAD(bool statusDTX, bool statusVAD, int16_t vadMode);
   VADDTXstruct GetVAD();
   int16_t VerifyTest();
-  AudioCodingModule* _acmA;
-  AudioCodingModule* _acmB;
+  scoped_ptr<AudioCodingModule> _acmA;
+  scoped_ptr<AudioCodingModule> _acmB;
 
   Channel* _channelA2B;