Update from https://crrev.com/316786

net/quic/quic_crypto_server_stream.cc

Index: net/quic/quic_crypto_server_stream.cc
diff --git a/net/quic/quic_crypto_server_stream.cc b/net/quic/quic_crypto_server_stream.cc
index 3ec65b0ecfb66bd887258937816be45e8bdbc08e..8e04298d608f634d4cf0f3fe509eccc2a4a3c0aa 100644
--- a/net/quic/quic_crypto_server_stream.cc
+++ b/net/quic/quic_crypto_server_stream.cc
@@ -32,7 +32,9 @@ QuicCryptoServerStream::QuicCryptoServerStream(
       crypto_config_(crypto_config),
       validate_client_hello_cb_(nullptr),
       num_handshake_messages_(0),
-      num_server_config_update_messages_sent_(0) {}
+      num_server_config_update_messages_sent_(0) {
+  DCHECK(session->connection()->is_server());
+}
 
 QuicCryptoServerStream::~QuicCryptoServerStream() {
   CancelOutstandingCallbacks();