Add QuicConnectionCloseDelegateInterface. No functional change expected. Not protected.

net/quic/quic_connection.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // The entity that handles framing writes for a Quic client or server.
 // Each QuicSession will have a connection associated with it.
 //
 // On the server side, the Dispatcher handles the raw reads, and hands off
 // packets via ProcessUdpPacket for framing and processing.
 //
@@ skipping 429 matching lines @@
   bool OnPaddingFrame(const QuicPaddingFrame& frame) override;
   bool OnPingFrame(const QuicPingFrame& frame) override;
   bool OnRstStreamFrame(const QuicRstStreamFrame& frame) override;
   bool OnConnectionCloseFrame(const QuicConnectionCloseFrame& frame) override;
   bool OnGoAwayFrame(const QuicGoAwayFrame& frame) override;
   bool OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) override;
   bool OnBlockedFrame(const QuicBlockedFrame& frame) override;
   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;
   const QuicFrame GetUpdatedAckFrame() override;
   void PopulateStopWaitingFrame(QuicStopWaitingFrame* stop_waiting) override;
 
   // QuicPacketCreator::DelegateInterface
   void OnSerializedPacket(SerializedPacket* packet) override;
-  void OnUnrecoverableError(QuicErrorCode error,
-                            const std::string& error_details,
-                            ConnectionCloseSource source) override;
 
   // QuicSentPacketManager::NetworkChangeVisitor
   void OnCongestionChange() override;
   void OnPathDegrading() override;
   void OnPathMtuIncreased(QuicPacketLength packet_size) override;
 
   // Called by the crypto stream when the handshake completes. In the server's
   // case this is when the SHLO has been ACKed. Clients call this on receipt of
   // the SHLO.
   void OnHandshakeComplete();
@@ skipping 596 matching lines @@
 
   // If true, multipath is enabled for this connection.
   bool multipath_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_H_