Fix indexeddb tests to implement proper setVersion semantics.

tests/html/indexeddb_2_test.dart

Index: tests/html/indexeddb_2_test.dart
diff --git a/tests/html/indexeddb_2_test.dart b/tests/html/indexeddb_2_test.dart
index 4c518d254a2568f8fd14c6cdda10c65433ae1041..cc1a27720a707d9babb1f90e9cc0d038b2ff64be 100644
--- a/tests/html/indexeddb_2_test.dart
+++ b/tests/html/indexeddb_2_test.dart
@@ -39,7 +39,7 @@ testReadWrite(key, value, check,
     request.on.error.add(fail);
   }
 
-  step1() {
+  step1([e]) {
     var transaction = db.transaction([storeName], 'readwrite');
     var request = transaction.objectStore(storeName).put(value, key);
     request.on.success.add(expectAsync1(step2));
@@ -56,7 +56,10 @@ testReadWrite(key, value, check,
       request.on.success.add(
         expectAsync1((e) {
           createObjectStore();
-          step1();
+
+          var transaction = e.target.result;
+          transaction.on.complete.add(expectAsync1(step1));
+          transaction.on.error.add(fail);
         })
       );
       request.on.error.add(fail);