Mark interop tests as failing on ff/win only

tests/html/html.status

Index: tests/html/html.status
diff --git a/tests/html/html.status b/tests/html/html.status
index e507b1305bf10f84c70ca333e327239735e8c42a..54d51c422fdae064a1a89bf41f63c51e4027e2e9 100644
--- a/tests/html/html.status
+++ b/tests/html/html.status
@@ -110,7 +110,6 @@ indexeddb_4_test: Fail     # Need window.mozIndexedDB instead of window.webkitIn
 instance_of_test: Fail     # Issue 2535
 # setup code fails. prepare. (DOM callback has errors) Caught [object Event]
 inner_frame_test: Skip
-js_interop_2_test: Pass, Fail  # Passes on Linux, Fails on Windows.
 localstorage_test: Fail
 # Interfaces not implemented: SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable
 svg_3_test: Fail
@@ -130,6 +129,10 @@ websocket_test: Pass, Fail # FF 10 is uses MozWebSocket, FF 11 uses WebSocket.
 #    (NS_ERROR_DOM_BAD_URI) ...
 xhr_test: Fail
 
+[ $runtime == ff && $system == windows ]
+# TODO(vsm): Investigate why this is only failing on windows.
+js_interop_2_test: Fail
+
 [ $runtime == ie && ($system == linux || $system == macos) ]
 *: Skip