Fix indexeddb tests to implement proper setVersion semantics.

tests/html/indexeddb_3_test.dart

Index: tests/html/indexeddb_3_test.dart
diff --git a/tests/html/indexeddb_3_test.dart b/tests/html/indexeddb_3_test.dart
index cd4663b5fcca1b1522600a93843b6ada36c94607..f443b80c41eb768f41eee8faf0e37da5207e9379 100644
--- a/tests/html/indexeddb_3_test.dart
+++ b/tests/html/indexeddb_3_test.dart
@@ -32,7 +32,10 @@ class Test {
           db.deleteObjectStore(STORE_NAME);
         } catch (IDBDatabaseException e) { }
         db.createObjectStore(STORE_NAME);
-        writeItems(0);
+
+        var transaction = e.target.result;
+        transaction.on.complete.add(expectAsync1((e) => writeItems(0)));
+        transaction.on.error.add(fail);
       })
     );
     request.on.error.add(fail('setVersion error'));