Remove the preprocessor symbol WEBRTC_CODEC_AVT (it was always defined)

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index d602bb4fdfc47bd63d44c66e780d29129fb7c726..fb29dfabab35ee5dbcf3d481de0449d65f8060e2 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -932,12 +932,8 @@ Channel::Init()
     // --- ACM initialization
 
     if ((audio_coding_->InitializeReceiver() == -1)
-#ifdef WEBRTC_CODEC_AVT
         // out-of-band Dtmf tones are played out by default
-        || (audio_coding_->SetDtmfPlayoutStatus(true) == -1)
-#endif
-       )
-    {
+        || (audio_coding_->SetDtmfPlayoutStatus(true) == -1)) {
         _engineStatisticsPtr->SetLastError(
             VE_AUDIO_CODING_MODULE_ERROR, kTraceError,
             "Channel::Init() unable to initialize the ACM - 1");