Removed Polymer from Observatory deps

packages/web_components/test/custom_element_proxy_test.dart

Index: packages/web_components/test/custom_element_proxy_test.dart
diff --git a/packages/web_components/test/custom_element_proxy_test.dart b/packages/web_components/test/custom_element_proxy_test.dart
index 5fa11e0dbe569ecb5145afde6fc9ac0aaab93c5a..d95012e6f69cd43afdb6a67f9b8557a53bb6f0cf 100644
--- a/packages/web_components/test/custom_element_proxy_test.dart
+++ b/packages/web_components/test/custom_element_proxy_test.dart
@@ -1,13 +1,13 @@
 // Copyright (c) 2015, 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.
+@TestOn('browser')
 library custom_element_proxy_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:js';
-import 'package:unittest/html_config.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 import 'package:web_components/web_components.dart';
 
 @CustomElementProxy('basic-element')
@@ -32,8 +32,7 @@ class ExtendedElement extends InputElement {
 }
 
 main() {
-  useHtmlConfiguration();
-  initWebComponents().then((_) {
+  return initWebComponents().then((_) {
     var container = querySelector('#container') as DivElement;
 
     tearDown(() {
@@ -42,15 +41,14 @@ main() {
 
     test('basic custom element', () {
       container.append(new BasicElement());
-      container.appendHtml('<basic-element></basic_element>');
+      container.appendHtml('<basic-element></basic_element>',
+          treeSanitizer: nullSanitizer);
       // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
       // why? https://github.com/dart-lang/web-components/issues/4
       return new Future(() {}).then((_) {
         var elements = container.querySelectorAll('basic-element');
         expect(elements.length, 2);
         for (BasicElement element in elements) {
-          print(element.outerHtml);
-          print(element.runtimeType);
           expect(element.isBasicElement, isTrue);
         }
       });
@@ -58,7 +56,8 @@ main() {
 
     test('extends custom element', () {
       container.append(new ExtendedElement());
-      container.appendHtml('<input is="extended-element" />');
+      container.appendHtml('<input is="extended-element" />',
+          treeSanitizer: nullSanitizer);
       // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
       // why? https://github.com/dart-lang/web-components/issues/4
       return new Future(() {}).then((_) {
@@ -71,3 +70,10 @@ main() {
     });
   });
 }
+
+class NullTreeSanitizer implements NodeTreeSanitizer {
+  const NullTreeSanitizer();
+  void sanitizeTree(Node node) {}
+}
+
+final nullSanitizer = const NullTreeSanitizer();