Update from https://crrev.com/303153

net/http/http_stream_factory.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.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 49 matching lines @@
     }
 
     if (!base::StringToInt(port_protocol_vector[0], &port) ||
         port <= 0 || port >= 1 << 16) {
       DVLOG(1) << kAlternateProtocolHeader
                << " header has unrecognizable port: "
                << port_protocol_vector[0];
       return;
     }
 
-    protocol =
-        AlternateProtocolFromString(port_protocol_vector[1]);
+    protocol = AlternateProtocolFromString(port_protocol_vector[1]);
+
     if (IsAlternateProtocolValid(protocol) &&
         !session.IsProtocolEnabled(protocol)) {
-      protocol = ALTERNATE_PROTOCOL_BROKEN;
-    }
-
-    if (protocol == ALTERNATE_PROTOCOL_BROKEN) {
       DVLOG(1) << kAlternateProtocolHeader
                << " header has unrecognized protocol: "
                << port_protocol_vector[1];
       return;
     }
   }
 
   if (protocol == UNINITIALIZED_ALTERNATE_PROTOCOL)
     return;
 
   HostPortPair host_port(http_host_port_pair);
   const HostMappingRules* mapping_rules = GetHostMappingRules();
   if (mapping_rules)
     mapping_rules->RewriteHost(&host_port);
 
   if (http_server_properties->HasAlternateProtocol(host_port)) {
     const AlternateProtocolInfo existing_alternate =
         http_server_properties->GetAlternateProtocol(host_port);
     // If we think the alternate protocol is broken, don't change it.
-    if (existing_alternate.protocol == ALTERNATE_PROTOCOL_BROKEN)
+    if (existing_alternate.is_broken)
       return;
   }
 
   http_server_properties->SetAlternateProtocol(host_port, port, protocol,
                                                probability);
 }
 
 GURL HttpStreamFactory::ApplyHostMappingRules(const GURL& url,
                                               HostPortPair* endpoint) {
   const HostMappingRules* mapping_rules = GetHostMappingRules();
   if (mapping_rules && mapping_rules->RewriteHost(endpoint)) {
     url::Replacements<char> replacements;
     const std::string port_str = base::IntToString(endpoint->port());
     replacements.SetPort(port_str.c_str(), url::Component(0, port_str.size()));
     replacements.SetHost(endpoint->host().c_str(),
                          url::Component(0, endpoint->host().size()));
     return url.ReplaceComponents(replacements);
   }
   return url;
 }
 
 HttpStreamFactory::HttpStreamFactory() {}
 
 }  // namespace net