Remove use of IterableMixinWorkaround from _List, _ImmutableList and _GrowableList.

tests/lib/mirrors/intercepted_object_test.dart

Index: tests/lib/mirrors/intercepted_object_test.dart
===================================================================
--- tests/lib/mirrors/intercepted_object_test.dart	(revision 41737)
+++ tests/lib/mirrors/intercepted_object_test.dart	(working copy)
@@ -16,6 +16,11 @@
   ClassMirror cls = reflect(object).type;
   checkClassMirrorMethods(cls);
 
+  // The VM implements List via a mixin, so check for that.
+  if (cls.superinterfaces.isEmpty && object is List) {
+    cls = cls.superclass.superclass.mixin;

[Ivan Posva, 2014/11/18 07:24:18]

This is similar hard coding as was removed in other places.

How is this supposed to work in dart2js?

[Florian Schneider, 2014/11/18 10:20:19]

Yes, but it is just a test which can easily be adapted, and it already works,
since this path is not taken with dart2js.

+  }
+
   List<ClassMirror> superinterfaces = cls.superinterfaces;
   String symName = 's($name)';
   for (ClassMirror superinterface in superinterfaces) {