Change simpleName of anonymous mixin applications.

dart/tests/lib/lib.status

Index: dart/tests/lib/lib.status
diff --git a/dart/tests/lib/lib.status b/dart/tests/lib/lib.status
index f51e164dceceac669b1017884c64a5acc9c690d3..7098bd16bc8124a1d10a760c84c8c015b7501d44 100644
--- a/dart/tests/lib/lib.status
+++ b/dart/tests/lib/lib.status
@@ -23,7 +23,7 @@ mirrors/method_mirror_properties_test: Fail # Issue 11861
 mirrors/method_mirror_returntype_test : Fail # Issue 11928
 mirrors/method_mirror_source_test : Fail # Issue 6490
 mirrors/mirrors_test: Fail # TODO(ahe): I'm working on fixing this.
-mirrors/mixin_test: Fail # Issue 12464
+mirrors/mixin_test/none: Fail # Issue 12464
 mirrors/null_test : Fail # Issue 12129
 mirrors/parameter_test: Fail # Issue 6490
 mirrors/parameter_metadata_test: Fail # Issue 10905
@@ -116,8 +116,8 @@ mirrors/native_class_test: Fail, OK # This test is meant to run in a browser.
 
 [ $runtime == vm || ($compiler == none && $runtime == drt) ]
 async/run_async3_test: Fail # _enqueueImmediate runs after Timer. http://dartbug.com/9001.
-mirrors/mixin_dart2js_test: Skip # TODO(ahe): This test is slightly broken. http://dartbug.com/12464
 mirrors/hierarchy_test: Fail # TODO(ahe): This test is slightly broken. http://dartbug.com/12464
+mirrors/mixin_test/01: Fail, OK # TODO(ahe): Slight broken test to ensure test coverage on dart2js.
 
 [ $compiler == none && $runtime == drt ]
 async/timer_isolate_test: Skip # See Issue 4997