[polymer.dart] fix *Changed observers inheriting

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index 30a728af34c71fd87f00d499b870ce3aa53c0f29..3843ed5116e360345d440a8f5a32b87258453f70 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -58,6 +58,7 @@ polymer/test/nested_binding_test: Skip # uses dart:html
 polymer/test/noscript_test: Skip #uses dart:html
 polymer/test/prop_attr_bind_reflection_test: Skip #uses dart:html
 polymer/test/prop_attr_reflection_test: Skip #uses dart:html
+polymer/test/property_change_test: Skip # uses dart:html
 polymer/test/publish_attributes_test: Skip #uses dart:html
 polymer/test/publish_inherited_properties_test: Skip #uses dart:html
 polymer/test/register_test: Skip #uses dart:html
@@ -104,6 +105,7 @@ polymer/test/event_path_test: Pass, Timeout # Issue 13260
 polymer/test/events_test: Pass, Timeout # Issue 13260
 polymer/test/nested_binding_test: Pass, Timeout # Issue 13260
 polymer/test/noscript_test: Pass, Timeout # Issue 13260
+polymer/test/property_change_test: Pass, Timeout # Issue 13260
 polymer/test/prop_attr_reflection_test: Pass, Timeout # Issue 13260
 polymer/test/prop_attr_bind_reflection_test: Pass, Timeout # Issue 13260
 polymer/test/publish_attributes_test: Pass, Timeout # Issue 13260