Update Isolate API.

tests/isolate/kill_self_test.dart

 // Copyright (c) 2014, 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.
 
 import "dart:isolate";
 import "dart:async";
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 
 isomain1(replyPort) {
   RawReceivePort port = new RawReceivePort();
   bool firstEvent = true;
   port.handler = (v) {
     if (!firstEvent) {
       throw "Survived suicide";
     }
     var controlPort = v[0];
     var killCapability = v[1];
     firstEvent = false;
     var isolate = new Isolate(controlPort,
                               terminateCapability: killCapability);
-    isolate.kill(Isolate.IMMEDIATE);
+    isolate.kill(priority: Isolate.IMMEDIATE);
   };
   replyPort.send(port.sendPort);
 }
 
 void main() {
   asyncStart();
   var completer = new Completer();  // Completed by first reply from isolate.
   RawReceivePort reply = new RawReceivePort(completer.complete);
   Isolate.spawn(isomain1, reply.sendPort).then((Isolate isolate) {
     completer.future.then((isolatePort) {
       RawReceivePort exitSignal;
       exitSignal = new RawReceivePort((_) {
         exitSignal.close();
         asyncEnd();
       });
       isolate.addOnExitListener(exitSignal.sendPort);
       isolatePort.send([isolate.controlPort, isolate.terminateCapability]);
       reply.close();
     });
   });
 }