Change core lib, dart2js, and more for new optional parameters syntax

tests/isolate/timer_repeat_test.dart

 // Copyright (c) 2012, 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('timer_repeat_test');
 
 #import("dart:isolate");
 #import('../../pkg/unittest/unittest.dart');
 
   const int TIMEOUT = 500;
@@ skipping 12 matching lines @@
       expect(iteration, ITERATIONS);
       timer.cancel();
     }
   }
 
 main() {
   test("timer_repeat", () {
     iteration = 0;
     startTime = new Date.now().millisecondsSinceEpoch;
     timer = new Timer.repeating(TIMEOUT, 
-        expectAsync1(timeoutHandler, count: ITERATIONS));
+        expectAsync1(timeoutHandler, ITERATIONS));

[Lasse Reichstein Nielsen, 2012/10/09 12:35:00]

Is the last parameter *ever* omitted? Otherwise, it should probably be passed
first (a small number value is best passed before a potential inline function).
If it's sometimes omitted, I liked the named version better - made it possible
to actually read it after a big handler.

[regis, 2012/10/11 01:33:56]

Yes, it is omitted a lot. I made count a named optional.

   });
 }