Add QuicConnectionCloseDelegateInterface. No functional change expected. Not protected.

net/quic/quic_connection.h

Index: net/quic/quic_connection.h
diff --git a/net/quic/quic_connection.h b/net/quic/quic_connection.h
index f1873198851595e681878437717a087d20a4f8c5..7014b07351cb790f74375afd47be5db2ead5a33a 100644
--- a/net/quic/quic_connection.h
+++ b/net/quic/quic_connection.h
@@ -447,6 +447,11 @@ class NET_EXPORT_PRIVATE QuicConnection
   bool OnPathCloseFrame(const QuicPathCloseFrame& frame) override;
   void OnPacketComplete() override;
 
+  // QuicConnectionCloseDelegateInterface
+  void OnUnrecoverableError(QuicErrorCode error,
+                            const std::string& error_details,
+                            ConnectionCloseSource source) override;
+
   // QuicPacketGenerator::DelegateInterface
   bool ShouldGeneratePacket(HasRetransmittableData retransmittable,
                             IsHandshake handshake) override;
@@ -455,9 +460,6 @@ class NET_EXPORT_PRIVATE QuicConnection
 
   // QuicPacketCreator::DelegateInterface
   void OnSerializedPacket(SerializedPacket* packet) override;
-  void OnUnrecoverableError(QuicErrorCode error,
-                            const std::string& error_details,
-                            ConnectionCloseSource source) override;
 
   // QuicSentPacketManager::NetworkChangeVisitor
   void OnCongestionChange() override;