Avoid calling anything related to signals on Windows

runtime/bin/vmservice/vmservice_io.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.
 
 library vmservice_io;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:mirrors';
 import 'dart:vmservice';
 
 part 'resources.dart';
 part 'server.dart';
 
 // The TCP ip/port that the HTTP server listens on.
 int _port;
 String _ip;
 // Should the HTTP server auto start?
 bool _autoStart;
 
+bool _isWindows = false;
+
 // HTTP servr.
 Server server;
 Future<Server> serverFuture;
 
 // The VM service instance.
 VMService service;
 
 void _onSignal(ProcessSignal signal) {
   if (serverFuture != null) {
     // Still waiting.
     return;
   }
   // Toggle HTTP server.
   if (server.running) {
     serverFuture = server.shutdown(true).then((_) {
       serverFuture = null;
     });
   } else {
     serverFuture = server.startup().then((_) {
       serverFuture = null;
     });
   }
 }
 
 void registerSignalHandler() {
+  if (_isWindows) {

[Anders Johnsen, 2014/06/18 07:24:10]

Use Platform.isWindows.

+    // Cannot register for signals on Windows.
+    return;
+  }
   bool useSIGQUIT = true;
   // Listen for SIGQUIT.
   if (useSIGQUIT) {
     var io = currentMirrorSystem().findLibrary(const Symbol('dart.io'));
     var c = MirrorSystem.getSymbol('_ProcessUtils', io);
     var m = MirrorSystem.getSymbol('_watchSignalInternal', io);
     var processUtils = io.declarations[c];
     processUtils.invoke(m, [ProcessSignal.SIGQUIT]).reflectee.listen(_onSignal);
   } else {
     ProcessSignal.SIGUSR1.watch().listen(_onSignal);
   }
 }
 
 
 main() {
   // Get VMService.
   service = new VMService();
   // Start HTTP server.
   server = new Server(service, _ip, _port);
   if (_autoStart) {
     server.startup();
   }
 
-  try {
-    registerSignalHandler();
-  } catch (_) {
-    // Listening for signals will fail on Windows.
-  }
+  registerSignalHandler();
 }