Removed Polymer from Observatory deps

packages/js_util/test/js_util_test.dart

-@JS()
-library js_util.test;
-
-import 'package:js/js.dart';
-import 'package:js_util/js_util.dart';
-import 'package:test/test.dart';
-
-@JS('JSON.stringify')
-external String stringify(Object json);
-
-void main() {
-  group('js_util tests', () {
-    test('defineProperty test', () {
-      final obj = newObject();
-      defineProperty(
-          obj, 'foo', new PropertyDescription(enumerable: true, value: 1));
-      defineProperty(
-          obj, 'bar', new PropertyDescription(enumerable: false, value: 2));
-
-      expect(stringify(obj), '{"foo":1}');
-    });
-
-    test('newObject/setValue/getValue test', () {
-      final obj = newObject();
-      setValue(obj, 'foo', 1);
-      setValue(obj, 'bar', 2);
-
-      expect(getValue(obj, 'foo'), equals(1));
-      expect(getValue(obj, 'bar'), equals(2));
-    });
-
-    test('toJS test', () {
-      final jsObj = toJS({
-        'people': [
-          {'firstName': 'Kwang Yul', 'lastName': 'Seo'},
-          {'firstName': 'DoHyung', 'lastName': 'Kim'},
-          {'firstName': 'Kyusun', 'lastName': 'Kim'}
-        ]
-      });
-
-      final people = getValue(jsObj, 'people');
-      expect(getValue(people[0], 'firstName'), equals('Kwang Yul'));
-      expect(getValue(people[0], 'lastName'), equals('Seo'));
-      expect(getValue(people[1], 'firstName'), equals('DoHyung'));
-      expect(getValue(people[1], 'lastName'), equals('Kim'));
-      expect(getValue(people[2], 'firstName'), equals('Kyusun'));
-      expect(getValue(people[2], 'lastName'), equals('Kim'));
-    });
-  });
-}