Revert "Mirrors implemented via patches."

runtime/lib/mirrors_patch.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.
-
-/**
- * Returns a [MirrorSystem] for the current isolate.
- */
-patch MirrorSystem currentMirrorSystem() {
-  return _Mirrors.currentMirrorSystem();
-}
-
-/**
- * Creates a [MirrorSystem] for the isolate which is listening on
- * the [SendPort].
- */
-patch Future<MirrorSystem> mirrorSystemOf(SendPort port) {
-  return _Mirrors.mirrorSystemOf(port);
-}
-
-/**
- * Returns an [InstanceMirror] for some Dart language object.
- *
- * This only works if this mirror system is associated with the
- * current running isolate.
- */
-patch InstanceMirror reflect(Object reflectee) {
-  return _Mirrors.reflect(reflectee);
-}