Deprecate SPDY/3.1 and draft HTTP/2 enum values.

net/socket/next_proto.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.
 
 #ifndef NET_SOCKET_NEXT_PROTO_H_
 #define NET_SOCKET_NEXT_PROTO_H_
 
 #include <vector>
 
 #include "net/base/net_export.h"
 
 namespace net {
 
 // Next Protocol Negotiation (NPN), if successful, results in agreement on an
 // application-level string that specifies the application level protocol to
 // use over the TLS connection. NextProto enumerates the application level
 // protocols that we recognize.  Do not change or reuse values, because they
 // are used to collect statistics on UMA.  Also, values must be in [0,499),
 // because of the way TLS protocol negotiation extension information is added to
 // UMA histogram.
 const int kProtoSPDYHistogramOffset = 100;
 enum NextProto {
   kProtoUnknown = 0,
   kProtoHTTP11 = 1,
-  kProtoMinimumVersion = kProtoHTTP11,
-
-  kProtoSPDY31 = 102,
-  kProtoSPDYMinimumVersion = kProtoSPDY31,
+  // kProtoSPDY31 = 102,
   // kProtoHTTP2_14 = 103,  // HTTP/2 draft-14
   // kProtoHTTP2_15 = 104,  // HTTP/2 draft-15
   // kProtoHTTP2_16 = 105,  // HTTP/2 draft-16
   // kProtoHTTP2_17 = 106,  // HTTP/2 draft-17
   kProtoHTTP2 = 107,  // HTTP/2, see https://tools.ietf.org/html/rfc7540.
-  kProtoSPDYMaximumVersion = kProtoHTTP2,
-
   kProtoQUIC1SPDY3 = 200,
-
-  kProtoMaximumVersion = kProtoQUIC1SPDY3,
 };
 
 // List of protocols to use for NPN, used for configuring HttpNetworkSessions.
 typedef std::vector<NextProto> NextProtoVector;
 
-// Convenience functions to create NextProtoVector.
-
-// Returns true if |next_proto| is a version of SPDY or HTTP/2.
-bool NextProtoIsSPDY(NextProto next_proto);
-
 }  // namespace net
 
 #endif  // NET_SOCKET_NEXT_PROTO_H_