Delete polymer from the Dart repo

pkg/polymer/test/template_attr_template_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:html';
-import 'package:polymer/polymer.dart';
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-
-int testsRun = 0;
-
-@CustomTag('decoration-test')
-class DecorationTest extends PolymerElement {
-  List<int> options = [1, 2, 3, 4];
-
-  DecorationTest.created() : super.created();
-
-  ready() {
-    this.test();
-    testsRun++;
-  }
-
-  test() {
-    expect($['select'].children.length, 5,
-        reason: 'attribute template stamped');
-  }
-}
-
-@CustomTag('decoration-test2')
-class DecorationTest2 extends DecorationTest {
-  List<List<int>> arrs = [ [1,2,3], [4,5,6] ];
-
-  DecorationTest2.created() : super.created();
-
-  test() {
-    expect($['tbody'].children.length, 3,
-        reason: 'attribute template stamped');
-    expect($['tbody'].children[1].children.length, 4,
-        reason: 'attribute sub-template stamped');
-  }
-}
-
-main() => initPolymer().run(() {
-  useHtmlConfiguration();
-
-  setUp(() => Polymer.onReady);
-
-  test('declaration-tests-ran', () {
-    expect(testsRun, 2, reason: 'decoration-tests-ran');
-  });
-});