Remove spawnDomFunction from dart:html

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 12bf0004d447f9e4262c316f0e0d71a2ec2021bc..21dbe9771a3282bee417c35a4fe97013621b3582 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -102,9 +102,6 @@ int _getNewIsolateId() {
 _callPortSync(int id, message) {
   return JS('var', r'ReceivePortSync.dispatchCall(#, #)', id, message);
 }
-
-Future<SendPort> spawnDomFunction(Function f) =>
-  new Future.value(IsolateNatives.spawnDomFunction(f));
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.