Clean up IOService implementation to be shared between patched and non-patched code.

runtime/bin/socket_patch.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class RawServerSocket {
   /* patch */ static Future<RawServerSocket> bind(address,
                                                   int port,
                                                   {int backlog: 0,
                                                    bool v6Only: false}) {
     return _RawServerSocket.bind(address, port, backlog, v6Only);
@@ skipping 204 matching lines @@
   final int typeFlags;
 
   // Holds the port of the socket, null if not known.
   int localPort;
 
   // Holds the address used to connect or bind the socket.
   InternetAddress address;
 
   static Future<List<InternetAddress>> lookup(
       String host, {InternetAddressType type: InternetAddressType.ANY}) {
-    return IOService.dispatch(SOCKET_LOOKUP, [host, type._value])
+    return _IOService.dispatch(_SOCKET_LOOKUP, [host, type._value])
         .then((response) {
           if (isErrorResponse(response)) {
             throw createError(response, "Failed host lookup: '$host'");
           } else {
             return response.skip(1).map((result) {
               var type = new InternetAddressType._from(result[0]);
               return new _InternetAddress(type, result[1], host, result[2]);
             }).toList();
           }
         });
   }
 
   static Future<InternetAddress> reverseLookup(InternetAddress addr) {
-    return IOService.dispatch(SOCKET_REVERSE_LOOKUP, [addr._sockaddr_storage])
+    return _IOService.dispatch(_SOCKET_REVERSE_LOOKUP, [addr._sockaddr_storage])
         .then((response) {
           if (isErrorResponse(response)) {
             throw createError(response, "Failed reverse host lookup", addr);
           } else {
             return addr._cloneWithNewHost(response);
           }
         });
   }
 
   static Future<List<NetworkInterface>> listInterfaces({
       bool includeLoopback: false,
       bool includeLinkLocal: false,
       InternetAddressType type: InternetAddressType.ANY}) {
-    return IOService.dispatch(SOCKET_LIST_INTERFACES, [type._value])
+    return _IOService.dispatch(_SOCKET_LIST_INTERFACES, [type._value])
         .then((response) {
           if (isErrorResponse(response)) {
             throw createError(response, "Failed listing interfaces");
           } else {
             var list = new List<NetworkInterface>();
             var map = response.skip(1)
                 .fold(new Map<String, List<InternetAddress>>(), (map, result) {
                   var type = new InternetAddressType._from(result[0]);
                   var name = result[3];
                   var address = new _InternetAddress(
@@ skipping 945 matching lines @@
     if (_detachReady != null) {
       _detachReady.complete(null);
     } else {
       if (_raw != null) {
         _raw.shutdown(SocketDirection.SEND);
         _disableWriteEvent();
       }
     }
   }
 }