Fixing element_types_test/supported_object

tools/dom/templates/html/impl/impl_Element.darttemplate

Index: tools/dom/templates/html/impl/impl_Element.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Element.darttemplate b/tools/dom/templates/html/impl/impl_Element.darttemplate
index 58c63f52d6e535a4761bafab31b82fd3f175242f..a93f8b909a4785561287cce3aed7a9cf6d545bc0 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -1028,7 +1028,7 @@ $if DART2JS
   // 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);

[sra1, 2013/02/04 22:46:37]

I'd write

// Firefox may return a JavaScript function which is no really any Dart type.
// =Object is the closes approximation to this.
JS('Element|=Object', ...)

 $else
   static Element createElement_tag(String tag) =>
       document.$dom_createElement(tag);