SPDY: Fix Alternate-Protocol.

net/base/host_port_pair.h

 // Copyright (c) 2010 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_BASE_HOST_PORT_PAIR_H_
 #define NET_BASE_HOST_PORT_PAIR_H_
 
 #include <string>
 #include "base/basictypes.h"
 
 namespace net {
 
 struct HostPortPair {
-  HostPortPair() {}
-  HostPortPair(const std::string& in_host, uint16 in_port)
-      : host(in_host), port(in_port) {}
+  HostPortPair();
+  // If |in_host| represents an IPv6 address, it should not bracket the address.
+  HostPortPair(const std::string& in_host, uint16 in_port);
 
   // Comparator function so this can be placed in a std::map.
   bool operator<(const HostPortPair& other) const {
     if (host != other.host)
       return host < other.host;
     return port < other.port;
   }
 
+  // ToString() will convert the HostPortPair to "host:port".  If |host| is an
+  // IPv6 literal, it will add brackets around |host|.
   std::string ToString() const;
 
+  // If |host| represents an IPv6 address, this string will not contain brackets
+  // around the address.
   std::string host;
   uint16 port;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_PORT_PAIR_H_