Move QuicVersionNegotiationState into QuicConnection, the only place it is used. No behavior change.

net/quic/core/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 1024 matching lines @@
   // packet number of the last sent packet.  Packets are guaranteed to be sent
   // in packet number order.
   QuicPacketNumber packet_number_of_last_sent_packet_;
 
   // Sent packet manager which tracks the status of packets sent by this
   // connection and contains the send and receive algorithms to determine when
   // to send packets.
   std::unique_ptr<QuicSentPacketManagerInterface> sent_packet_manager_;
 
   // The state of connection in version negotiation finite state machine.
+  enum QuicVersionNegotiationState {
+    START_NEGOTIATION = 0,
+    // Server-side this implies we've sent a version negotiation packet and are
+    // waiting on the client to select a compatible version.  Client-side this
+    // implies we've gotten a version negotiation packet, are retransmitting the
+    // initial packets with a supported version and are waiting for our first
+    // packet from the server.
+    NEGOTIATION_IN_PROGRESS,
+    // This indicates this endpoint has received a packet from the peer with a
+    // version this endpoint supports.  Version negotiation is complete, and the
+    // version number will no longer be sent with future packets.
+    NEGOTIATED_VERSION
+  };
   QuicVersionNegotiationState version_negotiation_state_;
 
   // Tracks if the connection was created by the server or the client.
   Perspective perspective_;
 
   // True by default.  False if we've received or sent an explicit connection
   // close.
   bool connected_;
 
   // Destination address of the last received packet.
@@ skipping 45 matching lines @@
   // Indicates whether a write error is encountered currently. This is used to
   // avoid infinite write errors.
   bool write_error_occured_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_H_