Various QUIC cleanups to sync with internal code.

net/quic/congestion_control/receive_algorithm_interface.cc

Index: net/quic/congestion_control/receive_algorithm_interface.cc
diff --git a/net/quic/congestion_control/receive_algorithm_interface.cc b/net/quic/congestion_control/receive_algorithm_interface.cc
index a49f64f160add005eb9414a0991903eeb324773f..fab4cfb0db515ea18108d806a02dfd4a4b5f8aad 100644
--- a/net/quic/congestion_control/receive_algorithm_interface.cc
+++ b/net/quic/congestion_control/receive_algorithm_interface.cc
@@ -5,6 +5,7 @@
 #include "net/quic/congestion_control/receive_algorithm_interface.h"
 
 #include "net/quic/congestion_control/fix_rate_receiver.h"
+#include "net/quic/congestion_control/inter_arrival_receiver.h"
 #include "net/quic/congestion_control/tcp_receiver.h"
 
 namespace net {
@@ -16,7 +17,7 @@ ReceiveAlgorithmInterface* ReceiveAlgorithmInterface::Create(
     case kTCP:
       return new TcpReceiver();
     case kInterArrival:
-      break;  // TODO(pwestin) Implement.
+      return new InterArrivalReceiver();
     case kFixRate:
       return new FixRateReceiver();
   }