Don't hardcode MediaType::ANY in FakeNetworkPipe.

webrtc/audio/test/low_bandwidth_audio_test.cc

Index: webrtc/audio/test/low_bandwidth_audio_test.cc
diff --git a/webrtc/audio/test/low_bandwidth_audio_test.cc b/webrtc/audio/test/low_bandwidth_audio_test.cc
index c1b1a02235610b51cfa708aa934eb6183ccc3275..50d7e674e83d11833f43808e6572cc86c2df842b 100644
--- a/webrtc/audio/test/low_bandwidth_audio_test.cc
+++ b/webrtc/audio/test/low_bandwidth_audio_test.cc
@@ -80,12 +80,14 @@ test::PacketTransport* AudioQualityTest::CreateSendTransport(
     Call* sender_call) {
   return new test::PacketTransport(
       sender_call, this, test::PacketTransport::kSender,
+      MediaType::AUDIO,
       GetNetworkPipeConfig());
 }
 
 test::PacketTransport* AudioQualityTest::CreateReceiveTransport() {
   return new test::PacketTransport(nullptr, this,
-      test::PacketTransport::kReceiver, GetNetworkPipeConfig());
+      test::PacketTransport::kReceiver, MediaType::AUDIO,
+      GetNetworkPipeConfig());
 }
 
 void AudioQualityTest::ModifyAudioConfigs(