Make TypedefMirror a direct descendant of TypeMirror.

tests/lib/lib.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.
 
 [ $runtime == dartium || $runtime == drt ]
 async/zone_run_guarded_test: Skip # Issue 14146
 async/zone_run_test: Skip # Issue 14146
 async/run_zoned9_test: Skip # Issue 14146
 
 [ $csp ]
@@ skipping 163 matching lines @@
 mirrors/native_class_test: Fail, OK # This test is meant to run in a browser.
 
 [ $compiler == none  ]
 async/schedule_microtask3_test: Fail # _enqueueImmediate runs after Timer. http://dartbug.com/9001.
 mirrors/hierarchy_test: Fail # TODO(ahe): This test is slightly broken. http://dartbug.com/12464
 mirrors/mixin_application_test/01: Fail, OK # TODO(ahe): Slight broken test to ensure test coverage on dart2js.
 mirrors/intercepted_object_test: Fail, OK # TODO(ahe): Slight broken test to ensure test coverage on dart2js.
 mirrors/typedef_test/01: Fail, OK # Incorrect dart2js behavior.
 mirrors/closures_test/01: Fail, OK # Incorrect dart2js behavior.
 
+mirrors/generic_f_bounded_test: RuntimeError # Issue 14000
 mirrors/generic_function_typedef_test: RuntimeError # Issue 12282
-mirrors/generic_f_bounded_test: RuntimeError # Issue 14000
 mirrors/generic_interface_test/01: RuntimeError # Issue 14113
+mirrors/generic_mixin_test/01: RuntimeError # Issue 14114
+mirrors/generic_mixin_test/02: RuntimeError # Issue 14113
 mirrors/immutable_collections_test: RuntimeError # Issue 14027
 mirrors/symbol_validation_test: RuntimeError # Issue 13596
-mirrors/generic_mixin_test/01: RuntimeError # Issue 14114
-mirrors/generic_mixin_test/02: RuntimeError # Issue 14113
+mirrors/typevariable_mirror_metadata_test/none: RuntimeError # Issue 12282
 
 async/timer_isolate_test: Skip # See Issue 4997
 async/timer_not_available_test: SkipByDesign # only meant to test when there is no way to implement timer (currently only in d8)
 
 [ $compiler == none && ( $runtime == drt || $runtime == dartium ) ]
 mirrors/library_uri_io_test: Skip # Not intended for drt as it uses dart:io.
 mirrors/local_isolate_test: Skip # http://dartbug.com/12188
 async/schedule_microtask6_test: Fail # Issue 10910
 async/schedule_microtask4_test: Fail # Issue 13921
 
 [ $compiler == none && ( $runtime == drt || $runtime == dartium ) && $system == macos]
 mirrors/constructor_kinds_test: Pass, Fail # Issue 13999
 
 [ $compiler == none && $runtime == drt && $system == windows ]
 async/multiple_timer_test: Fail, Pass # See Issue 10982
 async/timer_test: Fail, Pass # See Issue 10982
 
 [ $arch == simmips || $arch == mips ]
 convert/chunked_conversion_utf88_test: Pass, Slow # Issue 12025.
 convert/streamed_conversion_json_utf8_decode_test: Pass, Slow
 
 [ $arch == simarm ]
 convert/chunked_conversion_utf88_test: Pass, Slow # Issue 12644.
 convert/utf85_test: Pass, Slow # Issue 12644.
 
 [ $compiler == dartanalyzer ]
-mirrors/typedef_test/none: Fail # Issue 13093
+
 mirrors/generics_test/none: Fail # Issue 13432
 mirrors/generic_bounded_test/none: Fail # Issue 13432
 mirrors/generic_bounded_by_type_parameter_test/none: Fail # Issue 13432
+mirrors/generic_f_bounded_mixin_application_test: Fail # Issue 14116
+mirrors/generic_interface_test/none: Fail # Inexpressible in multitest
 mirrors/generic_mixin_test/none: Fail # Issue 13432
 mirrors/invoke_named_test/none: Fail # http://dartbug.com/13612
-mirrors/generic_f_bounded_mixin_application_test: Fail # Issue 14116
-mirrors/generic_interface_test/none: Fail # Inexpressible in multitest
-
-# test issue 14016
-mirrors/typevariable_mirror_metadata_test: fail
+mirrors/typedef_test/none: Fail # Issue 13093
+mirrors/typevariable_mirror_metadata_test/none: Fail # Issue 14016 - Covering broken VM behavior until Issue 13701 fixed.
 
 [ $compiler == dart2analyzer ]
-mirrors/typedef_test/none: Fail # Issue 13093
 mirrors/generics_test/none: Fail # Issue 13432
 mirrors/generic_bounded_test/none: Fail # Issue 13432
 mirrors/generic_bounded_by_type_parameter_test/none: Fail # Issue 13432
-mirrors/generic_mixin_test/none: Fail # Issue 13432
-mirrors/invoke_named_test/none: Fail # http://dartbug.com/13612
 mirrors/generic_f_bounded_mixin_application_test: Fail # Issue 14116
 mirrors/generic_interface_test/none: Fail # Inexpressible in multitest
+mirrors/generic_mixin_test/none: Fail # Issue 13432
+mirrors/generic_mixin_applications_test: Fail # Issue 13432
+mirrors/invoke_named_test/none: Fail # http://dartbug.com/13612
+mirrors/typedef_test/none: Fail # Issue 13093
+mirrors/typedef_metadata_test: Fail # Issue 13093
+mirrors/typevariable_mirror_metadata_test/none: Fail # Issue 14016 - Covering broken VM behavior until Issue 13701 fixed.
 
 [ $compiler == none && $runtime == dartium ]
 async/schedule_microtask5_test: Pass, Timeout # Issue 13719: Please triage this failure.
 async/timer_cancel2_test: Pass, Timeout # Issue 13719: Please triage this failure.
 
 [ $runtime != none && $runtime != drt && $runtime != dartium ]
 async/schedule_microtask_test: Fail # Issue 9001, Issue 9002