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.cc b/webrtc/modules/audio_coding/neteq4/dsp_helper.cc
index 7493e10..e1aa0e5 100644
--- a/webrtc/modules/audio_coding/neteq4/dsp_helper.cc
+++ b/webrtc/modules/audio_coding/neteq4/dsp_helper.cc
@@ -80,7 +80,7 @@
   return RampSignal(signal, length, factor, increment, signal);
 }
 
-int DspHelper::RampSignal(AudioMultiVector<int16_t>* signal,
+int DspHelper::RampSignal(AudioMultiVector* signal,
                           size_t start_index,
                           size_t length,
                           int factor,