Mark tests as failing on IE9

dart/tests/lib/lib.status

Index: dart/tests/lib/lib.status
diff --git a/dart/tests/lib/lib.status b/dart/tests/lib/lib.status
index 3b1858a6cd603c05fb45edfa36c2b10cbdef8083..ebf0add13d0ccdd241adeae2301367292eb61381 100644
--- a/dart/tests/lib/lib.status
+++ b/dart/tests/lib/lib.status
@@ -16,6 +16,9 @@ async/slow_consumer3_test: Fail # Issue 7733.
 async/slow_consumer_test: Fail # Issue 7733.
 async/slow_consumer2_test: Fail # Issue 7733.
 
+[ $compiler == dart2js && $runtime == ie9 ]
+async/deferred/deferred_api_test: Fail # http://dartbug.com/3940
+
 [ $compiler == dart2js && $jscl ]
 async/future_test: Fail # Timer interface not supported; dartbug.com/7728.
 async/slow_consumer2_test: Fail # Timer interface not supported; dartbug.com/7728.