Update from https://crrev.com/302630

net/quic/test_tools/quic_connection_peer.cc

Index: net/quic/test_tools/quic_connection_peer.cc
diff --git a/net/quic/test_tools/quic_connection_peer.cc b/net/quic/test_tools/quic_connection_peer.cc
index d2c639966b41c928b64a67b8a2b2f99c367b29a7..8a8df465bae621ce5c4f173ec286648e8981ba16 100644
--- a/net/quic/test_tools/quic_connection_peer.cc
+++ b/net/quic/test_tools/quic_connection_peer.cc
@@ -248,5 +248,11 @@ QuicPacketHeader* QuicConnectionPeer::GetLastHeader(
   return &connection->last_header_;
 }
 
+// static
+void QuicConnectionPeer::SetSequenceNumberOfLastSentPacket(
+    QuicConnection* connection, QuicPacketSequenceNumber number) {
+  connection->sequence_number_of_last_sent_packet_ = number;
+}
+
 }  // namespace test
 }  // namespace net