Delete polymer from the Dart repo

pkg/polymer/test/mirror_loader_test.dart

-// Copyright (c) 2013, 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.
-
-import 'dart:async';
-
-import 'dart:mirrors';
-
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-
-import 'package:polymer/src/mirror_loader.dart';
-/// prevent unused import warnings: [m1.XA] [m2.XA] [m3.XB] [m4.XA].
-import 'mirror_loader_1.dart' as m1;
-import 'mirror_loader_2.dart' as m2;
-import 'mirror_loader_3.dart' as m3;
-import 'mirror_loader_4.dart' as m4;
-
-main() {
-  useHtmlConfiguration();
-
-  test('registered correctly', () {
-    expect(_discover(#mirror_loader_test1).length, 1);
-    expect(_discover(#mirror_loader_test2).length, 1);
-  });
-
-  test('parameterized custom tags are not registered', () {
-    runZoned(() {
-      expect(_discover(#mirror_loader_test3).length, 0);
-    }, onError: (e) {
-      expect(e is UnsupportedError, isTrue);
-      expect('$e', contains(
-          'Custom element classes cannot have type-parameters: XB'));
-    });
-  });
-
-  test('registers correct types even when errors are found', () {
-    runZoned(() {
-      expect(_discover(#mirror_loader_test4).length, 1);
-    }, onError: (e) {
-      expect(e is UnsupportedError, isTrue);
-      expect('$e', contains(
-          'Custom element classes cannot have type-parameters: XB'));
-    });
-  });
-}
-
-final mirrors = currentMirrorSystem();
-_discover(Symbol name) =>
-    discoverInitializers([mirrors.findLibrary(name).uri.toString()]);