Fix indexeddb tests to implement proper setVersion semantics.

tests/html/indexeddb_2_test.dart

 #library('IndexedDB1Test');
 #import('../../lib/unittest/unittest.dart');
 #import('../../lib/unittest/html_config.dart');
 #import('dart:html');
 #import('dart:coreimpl');
 #import('utils.dart');
 
 // Write and re-read Maps: simple Maps; Maps with DAGs; Maps with cycles.
 
 final String DB_NAME = 'Test';
@@ skipping 21 matching lines @@
     var transaction = db.transaction(storeName, 'readonly');
     var request = transaction.objectStore(storeName).getObject(key);
     request.on.success.add(expectAsync1((e) {
         var object = e.target.result;
         check(value, object);
       })
     );
     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));
     request.on.error.add(fail);
   }
 
   initDb(e) {
     db = e.target.result;
     if (version != db.version) {
       // TODO.  Some browsers do this the w3 way - passing the version to the
       // open call and listening to onversionchange.  Can we feature-detect the
       // difference and make it work?
       var request = db.setVersion(version);
       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);
     } else {
       step1();
     }
   }
 
   var request = window.indexedDB.open(dbName);
   Expect.isNotNull(request);
@@ skipping 18 matching lines @@
   test('test_DAG', testReadWrite(123, obj2, verifyGraph));
   test('test_cycle', testReadWrite(123, obj3, verifyGraph));
   test('test_simple_splay', testReadWrite(123, obj4, verifyGraph));
 }
 
 main() {
   useHtmlConfiguration();
 
   tests_dynamic();
 }