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.cc b/webrtc/modules/audio_coding/neteq4/normal.cc
index 426df68..8d9c020 100644
--- a/webrtc/modules/audio_coding/neteq4/normal.cc
+++ b/webrtc/modules/audio_coding/neteq4/normal.cc
@@ -28,7 +28,7 @@
                     size_t length,
                     Modes last_mode,
                     int16_t* external_mute_factor_array,
-                    AudioMultiVector<int16_t>* output) {
+                    AudioMultiVector* output) {
   if (length == 0) {
     // Nothing to process.
     output->Clear();
@@ -55,7 +55,7 @@
     expand_->SetParametersForNormalAfterExpand();
 
     // Call Expand.
-    AudioMultiVector<int16_t> expanded(output->Channels());
+    AudioMultiVector expanded(output->Channels());
     expand_->Process(&expanded);
     expand_->Reset();