Delete polymer from the Dart repo

pkg/polymer/test/inject_bound_html_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:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-import 'package:polymer/polymer.dart';
-
-@CustomTag('x-foo')
-class XFoo extends PolymerElement {
-  @observable String bar = "baz";
-
-  XFoo.created() : super.created();
-
-  @ComputedProperty('bar')
-  String get ignore => readValue(#bar);
-}
-
-main() => initPolymer().run(() {
-  useHtmlConfiguration();
-
-  setUp(() => Polymer.onReady);
-
-  test('can inject bound html fragments', () {
-    XFoo xFoo = querySelector('x-foo');
-    DivElement injectDiv = xFoo.$['inject'];
-    xFoo.injectBoundHTML('<span>{{bar}}</span>', injectDiv);
-    expect(injectDiv.innerHtml, '<span>baz</span>');
-
-    xFoo.bar = 'bat';
-    return new Future(() {}).then((_) {
-      expect(injectDiv.innerHtml, '<span>bat</span>');
-    });
-  });
-});