NetEq4: Removing templatization for AudioMultiVector

This saves approx 6% runtime for neteq4_speed_test.
$ time out/Release/neteq4_speed_test --runtime_ms=50000000

BUG=1363
R=minyue@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2320006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4885 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/neteq4/expand.h b/webrtc/modules/audio_coding/neteq4/expand.h
index b51856f..f7f19e2 100644
--- a/webrtc/modules/audio_coding/neteq4/expand.h
+++ b/webrtc/modules/audio_coding/neteq4/expand.h
@@ -61,7 +61,7 @@
 
   // The main method to produce concealment data. The data is appended to the
   // end of |output|.
-  int Process(AudioMultiVector<int16_t>* output);
+  int Process(AudioMultiVector* output);
 
   // Prepare the object to do extra expansion during normal operation following
   // a period of expands.