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

net/quic/core/quic_connection.h

Index: net/quic/core/quic_connection.h
diff --git a/net/quic/core/quic_connection.h b/net/quic/core/quic_connection.h
index 456eec5fe609e4af22a2e99abe7dc1fd17512b57..bb86c425b542183c4c52db7d2afb5dd61f16fd1f 100644
--- a/net/quic/core/quic_connection.h
+++ b/net/quic/core/quic_connection.h
@@ -1042,6 +1042,19 @@ class NET_EXPORT_PRIVATE QuicConnection
   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.