Running entered & left view events in Dartium

tests/html/custom/entered_left_view_test.dart

Index: tests/html/custom/entered_left_view_test.dart
diff --git a/tests/html/custom/entered_left_view_test.dart b/tests/html/custom/entered_left_view_test.dart
index 79f65c8055be4f66f9a8c2fa598acb381a7d97e3..c22423438dc4d2bf402568b11b6b5c1678d5057c 100644
--- a/tests/html/custom/entered_left_view_test.dart
+++ b/tests/html/custom/entered_left_view_test.dart
@@ -62,7 +62,7 @@ main() {
   });
 
   group('standard_events', () {
-    var a = new Element.tag('x-a');
+    var a;
     setUp(() {
       invocations = [];
     });
@@ -105,7 +105,7 @@ main() {
   });
 
   group('viewless_document', () {
-    var a = docB.createElement('x-a');
+    var a;
     setUp(() {
       invocations = [];
     });