Forgot to add file to previous commit.

sdk/lib/html/templates/html/dart2js/impl_Url.darttemplate

Index: sdk/lib/html/templates/html/dart2js/impl_Url.darttemplate
===================================================================
--- sdk/lib/html/templates/html/dart2js/impl_Url.darttemplate	(revision 0)
+++ sdk/lib/html/templates/html/dart2js/impl_Url.darttemplate	(working copy)
@@ -0,0 +1,16 @@
+// 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
+// BSD-style license that can be found in the LICENSE file.
+
+class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+
+  static String createObjectUrl(blob_OR_source_OR_stream) =>
+      JS('String',
+         '(window.URL || window.webkitURL).createObjectURL(#)',
+         blob_OR_source_OR_stream);
+
+  static void revokeObjectUrl(String objectUrl) =>
+      JS('void',
+         '(window.URL || window.webkitURL).revokeObjectURL(#)', objectUrl);
+$!MEMBERS
+}