Remove the preprocessor symbol WEBRTC_CODEC_PCM16 (it was always defined)

webrtc/modules/audio_coding/main/test/TestRedFec.cc

Index: webrtc/modules/audio_coding/main/test/TestRedFec.cc
diff --git a/webrtc/modules/audio_coding/main/test/TestRedFec.cc b/webrtc/modules/audio_coding/main/test/TestRedFec.cc
index 6027a4d0e1ac6305120f8ae29f478fef1647a93d..a48b2ebdfec97d24a8f8c24537de6aa8f50ed576 100644
--- a/webrtc/modules/audio_coding/main/test/TestRedFec.cc
+++ b/webrtc/modules/audio_coding/main/test/TestRedFec.cc
@@ -82,10 +82,6 @@ void TestRedFec::Perform() {
   _acmA->RegisterTransportCallback(_channelA2B);
   _channelA2B->RegisterReceiverACM(_acmB.get());
 
-#ifndef WEBRTC_CODEC_PCM16
-  EXPECT_TRUE(false) << "PCM16 needs to be activated to run this test\n");
-  return;
-#endif
   EXPECT_EQ(0, RegisterSendCodec('A', kNameL16, 8000));
   EXPECT_EQ(0, RegisterSendCodec('A', kNameCN, 8000));
   EXPECT_EQ(0, RegisterSendCodec('A', kNameRED));