Remove use of IterableMixinWorkaround from _List, _ImmutableList and _GrowableList.

tests/lib/mirrors/intercepted_object_test.dart

 // Copyright (c) 2013, 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.
 
 // Ensure that objects handled specially by dart2js can be reflected on.
 
 library test.intercepted_object_test;
 
 import 'dart:mirrors';
 
 import 'stringify.dart' show stringify, expect;
 
 import 'intercepted_class_test.dart' show checkClassMirrorMethods;
 
 checkImplements(object, String name) {
   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) {
     print(superinterface.simpleName);
     if (symName == stringify(superinterface.simpleName)) {
       checkClassMirrorMethods(superinterface);
       return;
     }
   }
  
   // A class implements itself, even if not explicitly declared.
   if (symName == stringify(cls.simpleName)) {
     checkClassMirrorMethods(cls);
     return;
   }
 
   // TODO(floitsch): use correct fail
   expect(name, "super interface not found");
 }
 
 main() {
   checkImplements('', 'String');
   checkImplements(1, 'int');
   checkImplements(1.5, 'double');
   checkImplements(true, 'bool');
   checkImplements(false, 'bool');
   checkImplements([], 'List');
 }