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

tests/isolate/timer_repeat_test.dart

Index: tests/isolate/timer_repeat_test.dart
===================================================================
--- tests/isolate/timer_repeat_test.dart	(revision 13392)
+++ tests/isolate/timer_repeat_test.dart	(working copy)
@@ -30,6 +30,6 @@
     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.

   });
 }