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

net/quic/core/quic_protocol.h

Index: net/quic/core/quic_protocol.h
diff --git a/net/quic/core/quic_protocol.h b/net/quic/core/quic_protocol.h
index f18ee09597a5f39e1a0faa985e8bd32b9085e56e..750c8e24c6d5a895afc44003cff330cd6ea12653 100644
--- a/net/quic/core/quic_protocol.h
+++ b/net/quic/core/quic_protocol.h
@@ -262,20 +262,6 @@ struct NET_EXPORT_PRIVATE QuicPublicResetPacket {
   IPEndPoint client_address;
 };
 
-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
-};
-
 typedef QuicPacketPublicHeader QuicVersionNegotiationPacket;
 
 // A padding frame contains no payload.