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/normal.h b/webrtc/modules/audio_coding/neteq4/normal.h
index 23fcca5..fa14685 100644
--- a/webrtc/modules/audio_coding/neteq4/normal.h
+++ b/webrtc/modules/audio_coding/neteq4/normal.h
@@ -53,7 +53,7 @@
   int Process(const int16_t* input, size_t length,
               Modes last_mode,
               int16_t* external_mute_factor_array,
-              AudioMultiVector<int16_t>* output);
+              AudioMultiVector* output);
 
  private:
   int fs_hz_;