Enable IPv4 address mapped to IPv6.

net/socket/socket_descriptor.cc

Index: net/socket/socket_descriptor.cc
===================================================================
--- net/socket/socket_descriptor.cc	(revision 226214)
+++ net/socket/socket_descriptor.cc	(working copy)
@@ -12,6 +12,8 @@
 #include "base/basictypes.h"
 
 #if defined(OS_WIN)
+#include <ws2tcpip.h>
+#include "base/win/windows_version.h"
 #include "net/base/winsock_init.h"
 #endif
 
@@ -32,7 +34,18 @@
 SocketDescriptor CreateSocketDefault(int family, int type, int protocol) {
 #if defined(OS_WIN)
   EnsureWinsockInit();
-  return ::WSASocket(family, type, protocol, NULL, 0, WSA_FLAG_OVERLAPPED);
+  SocketDescriptor result = ::WSASocket(family, type, protocol, NULL, 0,
+                                        WSA_FLAG_OVERLAPPED);
+  if (result != kInvalidSocket && family == AF_INET6 &&
+      base::win::OSInfo::GetInstance()->version() >= base::win::VERSION_VISTA) {
+    DWORD value = 0;
+    if (setsockopt(result, IPPROTO_IPV6, IPV6_V6ONLY,
+                   reinterpret_cast<const char*>(&value), sizeof(value))) {
+      closesocket(result);
+      return kInvalidSocket;
+    }
+  }
+  return result;
 #else  // OS_WIN
   return ::socket(family, type, protocol);
 #endif  // OS_WIN