Update package:isolate to make kill priority named.

lib/isolate_runner.dart

 // Copyright (c) 2015, 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 isolate.isolate_runner;
 
 import "dart:async";
 import "dart:isolate";
 
 import 'ports.dart';
@@ skipping 83 matching lines @@
   /// If the isolate is already dead, the returned future will not complete.
   /// If that may be the case, use [Future.timeout] on the returned future
   /// to take extra action after a while. Example:
   ///
   ///     var f = isolate.kill();
   ///     f.then((_) => print('Dead')
   ///      .timeout(new Duration(...), onTimeout: () => print('No response'));
   Future kill({Duration timeout: const Duration(seconds: 1)}) {
     Future onExit = singleResponseFuture(isolate.addOnExitListener);
     if (Duration.ZERO == timeout) {
-      isolate.kill(Isolate.IMMEDIATE);
+      isolate.kill(priority: Isolate.IMMEDIATE);
       return onExit;
     } else {
       // Try a more gentle shutdown sequence.
       _commandPort.send(list1(_SHUTDOWN));
       return onExit.timeout(timeout, onTimeout: () {
-        isolate.kill(Isolate.IMMEDIATE);
+        isolate.kill(priority: Isolate.IMMEDIATE);
         return onExit;
       });
     }
   }
 
   /// Queries the isolate on whether it's alive.
   ///
   /// If the isolate is alive and responding to commands, the
   /// returned future completes with `true`.
   ///
@@ skipping 167 matching lines @@
       case _RUN:
         Function function = command[1];
         var argument = command[2];
         SendPort responsePort = command[3];
         sendFutureResult(new Future.sync(() => function(argument)),
                          responsePort);
         return;
     }
   }
 }