Remove DCHECK which breaks Target: //video/streaming/edge:edge_server_wrapper_test

The DCHECK was added in cr/684868287

PiperOrigin-RevId: 684962652

quiche/quic/core/quic_udp_socket.h

diff --git a/quiche/quic/core/quic_udp_socket.h b/quiche/quic/core/quic_udp_socket.h
index 001bc85..8bb2380 100644
--- a/quiche/quic/core/quic_udp_socket.h
+++ b/quiche/quic/core/quic_udp_socket.h
@@ -156,7 +156,6 @@
   }
 
   QuicEcnCodepoint ecn_codepoint() const {
-    QUICHE_DCHECK(HasValue(QuicUdpPacketInfoBit::ECN));
     return ecn_codepoint_;
   }