[Fuchsia] Bind Observatory to ipv4 any

runtime/bin/vmservice/server.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.
 
 part of vmservice_io;
 
 final bool silentObservatory =
     const bool.fromEnvironment('SILENT_OBSERVATORY');
 
 void serverPrint(String s) {
@@ skipping 314 matching lines @@
   Future startup() async {
     if (_server != null) {
       // Already running.
       return this;
     }
 
     // Startup HTTP server.
     try {
       var address;
       if (Platform.isFuchsia) {
-        address = InternetAddress.ANY_IP_V6;
+        address = InternetAddress.ANY_IP_V4;
       } else {
         var addresses = await InternetAddress.lookup(_ip);
         // Prefer IPv4 addresses.
         for (var i = 0; i < addresses.length; i++) {
           address = addresses[i];
           if (address.type == InternetAddressType.IP_V4) break;
         }
       }
       _server = await HttpServer.bind(address, _port);
       _server.listen(_requestHandler, cancelOnError: true);
@@ skipping 37 matching lines @@
       _notifyServerState("");
       onServerAddressChange(null);
       return this;
     });
   }
 
 }
 
 void _notifyServerState(String uri)
     native "VMServiceIO_NotifyServerState";