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

runtime/vm/snapshot_test.dart

Index: runtime/vm/snapshot_test.dart
===================================================================
--- runtime/vm/snapshot_test.dart	(revision 13683)
+++ runtime/vm/snapshot_test.dart	(working copy)
@@ -1412,7 +1412,7 @@
       if (count == 10) {
         remote.send(-1, reply);
       }
-    }, count: 11));
+    }, 11));
     remote.send(count++, reply);
   });
 }