Build fix for Win64 after r16521.

src/platform/socket.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 110 matching lines @@
   hint.ai_protocol = IPPROTO_TCP;
   int result = ::getaddrinfo(host, port, &hint, &info);
   if (result != 0) {
     return false;
   }
 
   // Connect to the host on the given port.
   for (struct addrinfo* ai = info; ai != NULL; ai = ai->ai_next) {
     // Try to connect using this addr info.
     while (true) {
-      result = ::connect(native_handle_, ai->ai_addr, ai->ai_addrlen);
+      result = ::connect(
+          native_handle_, ai->ai_addr, static_cast<int>(ai->ai_addrlen));
       if (result == 0) {
         freeaddrinfo(info);
         return true;
       }
 #if V8_OS_POSIX
       if (errno == EINTR) continue;  // Retry after signal.
 #endif
       break;
     }
   }
@@ skipping 72 matching lines @@
 #elif V8_OS_WIN
   // Be sure to initialize the WinSock DLL first.
   CallOnce(&initialize_winsock, &InitializeWinsock);
 
   // Now we can safely perform WSA calls.
   return ::WSAGetLastError();
 #endif
 }
 
 } }  // namespace v8::internal