Don't hardcode MediaType::ANY in FakeNetworkPipe.

webrtc/call/rampup_tests.cc

Index: webrtc/call/rampup_tests.cc
diff --git a/webrtc/call/rampup_tests.cc b/webrtc/call/rampup_tests.cc
index 292edc60836b4533d7ce5cb2c45fbee869821bd6..cc417276dbada0c1b3f4b49aad944138733e3e05 100644
--- a/webrtc/call/rampup_tests.cc
+++ b/webrtc/call/rampup_tests.cc
@@ -92,6 +92,7 @@ void RampUpTester::OnVideoStreamsCreated(
 test::PacketTransport* RampUpTester::CreateSendTransport(Call* sender_call) {
   send_transport_ = new test::PacketTransport(sender_call, this,
                                               test::PacketTransport::kSender,
+                                              MediaType::AUDIO,
                                               forward_transport_config_);
   return send_transport_;
 }