Add [TypeChecking=Interface] to the TextTrack interface

LayoutTests/media/track/opera/interfaces/TextTrack/removeCue.html

Index: LayoutTests/media/track/opera/interfaces/TextTrack/removeCue.html
diff --git a/LayoutTests/media/track/opera/interfaces/TextTrack/removeCue.html b/LayoutTests/media/track/opera/interfaces/TextTrack/removeCue.html
index 7143bd2b1edd01d8e0fcd3a608a2106179e5d29f..e9f90eb0cd3e3161aee9d668c4fbf9438678d2c9 100644
--- a/LayoutTests/media/track/opera/interfaces/TextTrack/removeCue.html
+++ b/LayoutTests/media/track/opera/interfaces/TextTrack/removeCue.html
@@ -27,6 +27,15 @@ test(function() {
         t2.removeCue(c1);
     }, 'standalone, remove from t2');
 }, document.title+', two elementless tracks');
+
+test(function() {
+    var t1 = video.addTextTrack('subtitles');
+    assert_equals(t1.cues.length, 0);
+    assert_throws(new TypeError, function() { t1.removeCue(null); }, 'null');
+    assert_throws(new TypeError, function() { t1.removeCue([]); }, 'non-TextTrackCue');
+    assert_equals(t1.cues.length, 0);
+}, document.title+', invalid values');
+
 var t = async_test(document.title+', cue from track element');
 t.step(function(){
     var t1 = video.addTextTrack('subtitles');