Fixing some indexed_db tests.

tests/html/indexeddb_1_test.dart

 library IndexedDB1Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html' as html;
 import 'dart:indexed_db' as idb;
 
 const String DB_NAME = 'Test';
 const String STORE_NAME = 'TEST';
 const int VERSION = 1;
 
@@ skipping 21 matching lines @@
       var object = e.target.result;
       db.close();
       expect(object, matcher);
     }));
     request.onError.listen(fail);
   }
 
   step1() {
     var transaction = db.transaction([storeName], 'readwrite');
     var request = transaction.objectStore(storeName).put(value, key);
-    request.onSuccess.listen(expectAsync1(step2));
     request.onError.listen(fail);
+
+    transaction.onComplete.listen(expectAsync1(step2));
   }
 
   initDb(e) {
     db = e.target.result;
     if (version != db.version) {
       // Legacy 'setVersion' upgrade protocol. Chrome 23 and earlier.
       var request = db.setVersion('$version');
       request.onSuccess.listen(
         expectAsync1((e) {
           createObjectStore(db);
@@ skipping 54 matching lines @@
       var object = e.target.result;
       db.close();
       expect(object, matcher);
     }));
     request.onError.listen(fail);
   }
 
   step1() {
     idb.Transaction transaction = db.transaction([storeName], 'readwrite');
     idb.Request request = transaction.objectStore(storeName).put(value, key);
-    request.onSuccess.listen(expectAsync1(step2));
     request.onError.listen(fail);
+
+    transaction.onComplete.listen(expectAsync1(step2));
   }
 
   initDb(e) {
     db = e.target.result;
     if (version != db.version) {
       // Legacy 'setVersion' upgrade protocol.
       idb.Request request = db.setVersion('$version');
       request.onSuccess.listen(
         expectAsync1((e) {
           createObjectStore(db);
@@ skipping 65 matching lines @@
       var db = html.window.indexedDB;
     }, expectation);
   });
 
   // Don't bother with these tests if it's unsupported.
   if (idb.IdbFactory.supported) {
     tests_dynamic();
     tests_typed();
   }
 }