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/dsp_helper.h b/webrtc/modules/audio_coding/neteq4/dsp_helper.h
index 9df6fd3..60cd995 100644
--- a/webrtc/modules/audio_coding/neteq4/dsp_helper.h
+++ b/webrtc/modules/audio_coding/neteq4/dsp_helper.h
@@ -67,7 +67,7 @@
 
   // Same as above, but processes |length| samples from |signal|, starting at
   // |start_index|.
-  static int RampSignal(AudioMultiVector<int16_t>* signal,
+  static int RampSignal(AudioMultiVector* signal,
                         size_t start_index,
                         size_t length,
                         int factor,