Convert String and List to abstract classes.

runtime/tests/vm/vm.status

 # 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.
 
 # When a spawned isolate throws an uncaught exception, we terminate the vm.
 cc/RunLoop_ExceptionChild: Fail
 
 # These tests are expected to crash on all platforms.
 cc/ArrayNew_Overflow_Crash: Crash
 cc/AllocGeneric_Overflow: Crash
 
 cc/SNPrint_BadArgs: Skip
 
+# This test assumes tthat the core library doesn't change and, e.g., that
+# it contains interfaces.
+# It should test the mirror system on a library that is controlled by
+# the test instead.
+dart/isolate_mirror_local_test: Fail
+
 [ $arch == x64 ]
 cc/IsolateInterrupt: Skip
 
 [ $system == windows && $mode == debug ]
 cc/Sleep: Pass, Fail  # Flaky on buildbot. Issue 5133.
 cc/Monitor: Pass, Fail  # Flaky on buildbot. Issue 5133.
 
 # The following section refers to the dart vm tests which live under
 # runtime/tests/vm/dart.
 
 [ $system == windows ]
 cc/Dart2JSCompileAll: Skip
 
 [ $runtime == drt ]
 dart/isolate_mirror_local_test: Skip
 
 [ $compiler == dart2js || $compiler == dartc ]
 dart/isolate_mirror*: Skip # compilers not aware of dart:mirrors
 dart/byte_array_test: Skip # compilers not aware of byte arrays
 
 [ $compiler == dart2dart ]
 # Skip until we stabilize language tests.
 *: Skip
 
 [ $arch == arm ]
 dart/*: Skip
 
 [ $arch == simarm ]
 dart/*: Skip