[SPDY] Remove references to obsolete SPDY versions SPDY/1 and SPDY/2.1

net/http/http_stream_factory_impl.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_stream_factory_impl.h"
 
 #include <string>
 
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 189 matching lines @@
   const HttpServerProperties& http_server_properties =
       *session_->http_server_properties();
   if (!http_server_properties.HasAlternateProtocol(origin))
     return kNoAlternateProtocol;
 
   PortAlternateProtocolPair alternate =
       http_server_properties.GetAlternateProtocol(origin);
   if (alternate.protocol == ALTERNATE_PROTOCOL_BROKEN)
     return kNoAlternateProtocol;
 
-  DCHECK_LE(NPN_SPDY_1, alternate.protocol);
-  DCHECK_GT(NUM_ALTERNATE_PROTOCOLS, alternate.protocol);
-
-  if (alternate.protocol < NPN_SPDY_2)
+  if (!IsAlternateProtocolValid(alternate.protocol)) {
+    NOTREACHED();
     return kNoAlternateProtocol;
+  }
 
   // Some shared unix systems may have user home directories (like
   // http://foo.com/~mike) which allow users to emit headers.  This is a bad
   // idea already, but with Alternate-Protocol, it provides the ability for a
   // single user on a multi-user system to hijack the alternate protocol.
   // These systems also enforce ports <1024 as restricted ports.  So don't
   // allow protocol upgrades to user-controllable ports.
   const int kUnrestrictedPort = 1024;
   if (!session_->params().enable_user_alternate_protocol_ports &&
       (alternate.port >= kUnrestrictedPort &&
@@ skipping 127 matching lines @@
        it != requests_to_fail.end(); ++it) {
     Request* request = *it;
     if (request == request_map_[job]) {
       continue;
     }
     request->OnStreamFailed(NULL, status, used_ssl_config);
   }
 }
 
 }  // namespace net