| Index: LayoutTests/media/encrypted-media/encrypted-media-playback-setmediakeys-after-src.html | 
| diff --git a/LayoutTests/media/encrypted-media/encrypted-media-playback-setmediakeys-after-src.html b/LayoutTests/media/encrypted-media/encrypted-media-playback-setmediakeys-after-src.html | 
| index 0de983c1457d3ecac8dd5471bd128a29bf844498..c045e37bdcbc80ac10231afaa8e2b304ce46b5f6 100644 | 
| --- a/LayoutTests/media/encrypted-media/encrypted-media-playback-setmediakeys-after-src.html | 
| +++ b/LayoutTests/media/encrypted-media/encrypted-media-playback-setmediakeys-after-src.html | 
| @@ -74,7 +74,8 @@ | 
| waitForEventAndRunStep('playing', video, onPlaying, test); | 
|  | 
| video.src = '../content/test-encrypted.webm'; | 
| -                    video.setMediaKeys(mediaKeys); | 
| +                    return video.setMediaKeys(mediaKeys); | 
| +                }).then(function(result) { | 
| video.play(); | 
| }).catch(function(error) { | 
| forceTestFailureFromPromise(test, error); | 
|  |