Cleanup for pkg/observe and pkg/polymer

pkg/polymer/test/property_change_test.dart

Index: pkg/polymer/test/property_change_test.dart
diff --git a/pkg/polymer/test/property_change_test.dart b/pkg/polymer/test/property_change_test.dart
index 60d6c849c2bb2c6d81a646e038e6a9ccff26afca..fbbda2ecf1fdb6cdbb881de579e766a467dac4f5 100644
--- a/pkg/polymer/test/property_change_test.dart
+++ b/pkg/polymer/test/property_change_test.dart
@@ -5,7 +5,6 @@
 library polymer.test.property_change_test;
 
 import 'dart:async';
-import 'dart:html';

[kevmoo, 2014/03/17 01:35:03]

an unused import. Required to force drt tests? Not sure. A comment would be good
if that's the case

[Siggi Cherem (dart-lang), 2014/03/17 17:45:18]

not sure - but easy to test it out :)

If you run test.py on all configurations and it's all good, then we can delete
it.

[Jennifer Messerly, 2014/03/17 18:06:10]

it shouldn't be needed anymore AFAIK

 import 'package:polymer/polymer.dart';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';