Make List an abstract class.

runtime/tests/vm/dart/isolate_mirror_local_test.dart

 // Copyright (c) 2012, 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.
 //
 // Dart test program for checking implemention of MirrorSystem when
 // inspecting the current isolate.
 //
 // VMOptions=--enable_type_checks
 
 library isolate_mirror_local_test;
@@ skipping 286 matching lines @@
   LibraryMirror mirror_lib = libraries['dart:mirrors'];
   Expect.isTrue(mirror_lib is LibraryMirror);
 
   // Lookup an interface from a library and make sure it is sane.
   ClassMirror list_intf = core_lib.members['List'];
   Expect.isTrue(list_intf is ClassMirror);
   Expect.equals('List', list_intf.simpleName);
   Expect.equals('dart:core.List', list_intf.qualifiedName);
   Expect.isFalse(list_intf.isPrivate);
   Expect.equals('Object', list_intf.superclass.simpleName);
-  Expect.equals('_ListImpl', list_intf.defaultFactory.simpleName);
   Expect.equals('dart:core', list_intf.owner.simpleName);
-  Expect.isFalse(list_intf.isClass);
+  Expect.isTrue(list_intf.isClass);
   Expect.equals('Collection', list_intf.superinterfaces[0].simpleName);
   Expect.equals("ClassMirror on 'List'", list_intf.toString());
 
   // Lookup a class from a library and make sure it is sane.
   ClassMirror oom_cls = core_lib.members['OutOfMemoryError'];
   Expect.isTrue(oom_cls is ClassMirror);
   Expect.equals('OutOfMemoryError', oom_cls.simpleName);
   Expect.equals('dart:core.OutOfMemoryError', oom_cls.qualifiedName);
   Expect.isFalse(oom_cls.isPrivate);
   Expect.equals('Object', oom_cls.superclass.simpleName);
@@ skipping 213 matching lines @@
   // Test that an isolate can reflect on itself.
   mirrorSystemOf(exit_port.toSendPort()).then(testMirrorSystem);
 
   testIntegerInstanceMirror(reflect(1001));
   testStringInstanceMirror(reflect('This\nis\na\nString'));
   testBoolInstanceMirror(reflect(true));
   testNullInstanceMirror(reflect(null));
   testCustomInstanceMirror(reflect(new MyClass(17)));
   testMirrorErrors(currentMirrorSystem());
 }