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

tests/lib/math/coin_test.dart

Index: tests/lib/math/coin_test.dart
===================================================================
--- tests/lib/math/coin_test.dart	(revision 13588)
+++ tests/lib/math/coin_test.dart	(working copy)
@@ -25,5 +25,5 @@
   print("Heads: $heads\n"
         "Tails: $tails\n"
         "Ratio: ${heads/tails}\n");
-  Expect.approxEquals(1.0, heads/tails, tolerance:0.1);
+  Expect.approxEquals(1.0, heads/tails, 0.1);

[Lasse Reichstein Nielsen, 2012/10/12 07:52:19]

Unrelated comment: That looks flakey ... with ~1 flake every 2500000 runs. :)

 }