Address Stephen's comments.

tests/html/indexeddb_1_test.dart

Index: tests/html/indexeddb_1_test.dart
diff --git a/tests/html/indexeddb_1_test.dart b/tests/html/indexeddb_1_test.dart
index 0c876e72e3f3d2e1ae8027dd8284120660f492cd..d3882b651cfa3f62eb17b89561b76ff9971361e5 100644
--- a/tests/html/indexeddb_1_test.dart
+++ b/tests/html/indexeddb_1_test.dart
@@ -34,7 +34,7 @@ testReadWrite(key, value, check,
     request.on.error.add(fail);
   }
 
-  step1([e]) {
+  step1() {
     var transaction = db.transaction([storeName], 'readwrite');
     var request = transaction.objectStore(storeName).put(value, key);
     request.on.success.add(expectAsync1(step2));
@@ -53,7 +53,7 @@ testReadWrite(key, value, check,
           createObjectStore();
 
           var transaction = e.target.result;
-          transaction.on.complete.add(expectAsync1(step1));
+          transaction.on.complete.add(expectAsync1((e) => step1()));
           transaction.on.error.add(fail);
         })
       );