Optimize dartium dart:html bindings so real world application performance is acceptable. Improves d…

tests/html/wrapping_collections_test.dart

Index: tests/html/wrapping_collections_test.dart
diff --git a/tests/html/wrapping_collections_test.dart b/tests/html/wrapping_collections_test.dart
index 176bcad308f515d377c6b4ade3462a8dd8ba2988..218d255b46a456c3a602f3c65e6abe651f9a30c7 100644
--- a/tests/html/wrapping_collections_test.dart
+++ b/tests/html/wrapping_collections_test.dart
@@ -18,7 +18,7 @@ main() {
   });
 
   test("Access through dart:html", () {
-    var dartPerformance = wrap_jso(js.context['performance']);
+    var dartPerformance = js.JsNative.toTypedObject(js.context['performance']);
     var dartEntries = dartPerformance.getEntries();
     dartEntries.forEach((x) {
         expect(x is PerformanceEntry, isTrue);