Removed Polymer from Observatory deps

packages/polymer/test/prop_attr_bind_reflection_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:html';
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-import 'package:polymer/polymer.dart';
-
-@CustomTag('my-child-element')
-class MyChildElement extends PolymerElement {
-  @PublishedProperty(reflect: true) int camelCase;
-  @PublishedProperty(reflect: true) int lowercase;
-
-  // TODO(sigmund): remove once codegen in polymer is turned on.
-  @reflectable get attributes => super.attributes;
-
-  MyChildElement.created() : super.created();
-
-  // Make this a no-op, so we can verify the initial
-  // reflectPropertyToAttribute works.
-  @override
-  openPropertyObserver() {}
-}
-
-@CustomTag('my-element')
-class MyElement extends PolymerElement {
-  @observable int volume = 11;
-
-  MyElement.created() : super.created();
-}
-
-main() => initPolymer().then((zone) => zone.run(() {
-  useHtmlConfiguration();
-
-  setUp(() => Polymer.onReady);
-
-  test('attribute reflected to property name', () {
-    var child = querySelector('my-element').shadowRoot
-        .querySelector('my-child-element');
-    expect(child.lowercase, 11);
-    expect(child.camelCase, 11);
-
-    expect(child.attributes['lowercase'], '11');
-    expect(child.attributes['camelcase'], '11');
-  });
-}));