Fixing element_types_test/supported_object

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 90a145b0166a35429bb682e7e98bc442f1efa9ab..57bc0c929d12e8aa4f9731de8397eecffd1b671d 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -9727,7 +9727,7 @@ class _ElementFactoryProvider {
   // Optimization to improve performance until the dart2js compiler inlines this
   // method.
   static dynamic createElement_tag(String tag) =>
-      JS('Element', 'document.createElement(#)', tag);
+      JS('Element|Function', 'document.createElement(#)', tag);
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
@@ -18277,7 +18277,6 @@ class OListElement extends Element native "*HTMLOListElement" {
 @DocsEditable
 @DomName('HTMLObjectElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
-@SupportedBrowser(SupportedBrowser.FIREFOX)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 class ObjectElement extends Element native "*HTMLObjectElement" {