[SPDY] Do not advertise SPDY/2 by default

net/http/http_server_properties.cc

 // 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.
 
 #include "net/http/http_server_properties.h"
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 
 namespace net {
@@ skipping 20 matching lines @@
 
 }  // namespace
 
 bool IsAlternateProtocolValid(AlternateProtocol protocol) {
   return protocol >= ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION &&
       protocol <= ALTERNATE_PROTOCOL_MAXIMUM_VALID_VERSION;
 }
 
 const char* AlternateProtocolToString(AlternateProtocol protocol) {
   switch (protocol) {
-    case NPN_SPDY_2:
+    case DEPRECATED_NPN_SPDY_2:
     case NPN_SPDY_3:
     case NPN_SPDY_3_1:
     case NPN_SPDY_4A2:
     case NPN_HTTP2_DRAFT_04:
     case QUIC:
       DCHECK(IsAlternateProtocolValid(protocol));
       return kAlternateProtocolStrings[
           protocol - ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION];
     case ALTERNATE_PROTOCOL_BROKEN:
       return kBrokenAlternateProtocol;
@@ skipping 11 matching lines @@
     if (str == AlternateProtocolToString(protocol))
       return protocol;
   }
   if (str == kBrokenAlternateProtocol)
     return ALTERNATE_PROTOCOL_BROKEN;
   return UNINITIALIZED_ALTERNATE_PROTOCOL;
 }
 
 AlternateProtocol AlternateProtocolFromNextProto(NextProto next_proto) {
   switch (next_proto) {
-    case kProtoSPDY2:
-      return NPN_SPDY_2;
+    case kProtoDeprecatedSPDY2:
+      return DEPRECATED_NPN_SPDY_2;
     case kProtoSPDY3:
       return NPN_SPDY_3;
     case kProtoSPDY31:
       return NPN_SPDY_3_1;
     case kProtoSPDY4a2:
       return NPN_SPDY_4A2;
     case kProtoHTTP2Draft04:
       return NPN_HTTP2_DRAFT_04;
     case kProtoQUIC1SPDY3:
       return QUIC;
 
     case kProtoUnknown:
     case kProtoHTTP11:
       break;
   }
 
   NOTREACHED() << "Invalid NextProto: " << next_proto;
   return UNINITIALIZED_ALTERNATE_PROTOCOL;
 }
 
 std::string PortAlternateProtocolPair::ToString() const {
   return base::StringPrintf("%d:%s", port,
                             AlternateProtocolToString(protocol));
 }
 
 }  // namespace net