Delete polymer from the Dart repo

pkg/polymer/test/template_distribute_dynamic_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';
-
-@CustomTag('x-test')
-class XTest extends PolymerElement {
-  @observable List list;
-
-  final _attached = new Completer();
-  Future onTestDone;
-
-  XTest.created() : super.created() {
-    onTestDone = _attached.future.then(_runTest);
-  }
-
-  attached() {
-    super.attached();
-    _attached.complete();
-  }
-
-  _runTest(_) {
-    list = [
-      {'name': 'foo'},
-      {'name': 'bar'}
-    ];
-    return new Future(() {
-      // tickle SD polyfill
-      offsetHeight;
-      var children = this.$['echo'].children;
-      expect(children[0].localName, 'template', reason:
-          'shadowDOM dynamic distribution via template');
-      expect(children[1].text, 'foo', reason:
-          'shadowDOM dynamic distribution via template');
-      expect(children[2].text, 'bar', reason:
-          'shadowDOM dynamic distribution via template');
-      expect(children.length, 3, reason: 'expected number of children');
-    });
-  }
-}
-
-main() => initPolymer().run(() {
-  useHtmlConfiguration();
-
-  setUp(() => Polymer.onReady);
-
-  test('inserted called', () => (querySelector('x-test') as XTest).onTestDone);
-});