Updated for expected FF failure.

TBR=sra@google.com

Change-Id: I6eff83c4dd8f4e77a372fa5e17d0bce37c061ea4
Reviewed-on: https://dart-review.googlesource.com/56465
Reviewed-by: Terry Lucas <terry@google.com>
diff --git a/tests/lib_2/lib_2_dart2js.status b/tests/lib_2/lib_2_dart2js.status
index 95380c0..785d1a3 100644
--- a/tests/lib_2/lib_2_dart2js.status
+++ b/tests/lib_2/lib_2_dart2js.status
@@ -371,6 +371,7 @@
 html/input_element_datetime_test: Fail
 html/input_element_month_test: Fail
 html/input_element_week_test: Fail
+html/interactive_media_test: RuntimeError # Not supported in FF
 html/media_stream_test: Fail
 html/messageevent_test: Pass, RuntimeError # Issue 28983
 html/request_animation_frame_test: Skip # Async test hangs.