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/TestStereo.h b/webrtc/modules/audio_coding/main/test/TestStereo.h
index 38a9793..53e4f28 100644
--- a/webrtc/modules/audio_coding/main/test/TestStereo.h
+++ b/webrtc/modules/audio_coding/main/test/TestStereo.h
@@ -13,6 +13,7 @@
 
 #include <math.h>
 
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
 #include "ACMTest.h"
 #include "Channel.h"
 #include "PCMFile.h"
@@ -83,8 +84,8 @@
 
   int test_mode_;
 
-  AudioCodingModule* acm_a_;
-  AudioCodingModule* acm_b_;
+  scoped_ptr<AudioCodingModule> acm_a_;
+  scoped_ptr<AudioCodingModule> acm_b_;
 
   TestPackStereo* channel_a2b_;