Revert of Don't hardcode MediaType::ANY in FakeNetworkPipe.

webrtc/test/fake_network_pipe.h

Index: webrtc/test/fake_network_pipe.h
diff --git a/webrtc/test/fake_network_pipe.h b/webrtc/test/fake_network_pipe.h
index 491d703b28aa86e965c84313c88b08953eded5e5..23521248f7d40e0d03211c9d2df531f8427bbe2c 100644
--- a/webrtc/test/fake_network_pipe.h
+++ b/webrtc/test/fake_network_pipe.h
@@ -26,7 +26,6 @@
 class Clock;
 class CriticalSectionWrapper;
 class PacketReceiver;
-enum class MediaType;
 
 class NetworkPacket {
  public:
@@ -84,10 +83,9 @@
     int avg_burst_loss_length = -1;
   };
 
-  FakeNetworkPipe(Clock* clock, const FakeNetworkPipe::Config& config,
-                  MediaType media_type);
+  FakeNetworkPipe(Clock* clock, const FakeNetworkPipe::Config& config);
   FakeNetworkPipe(Clock* clock,
-                  const FakeNetworkPipe::Config& config, MediaType media_type,
+                  const FakeNetworkPipe::Config& config,
                   uint64_t seed);
   ~FakeNetworkPipe();
 
@@ -113,7 +111,6 @@
 
  private:
   Clock* const clock_;
-  const MediaType media_type_;
   rtc::CriticalSection lock_;
   PacketReceiver* packet_receiver_;
   std::queue<NetworkPacket*> capacity_link_;