Case: invoke play() on an element with MEDIA_ERR_SRC_NOT_SUPPORTED has been set.
Expected result: reject the promise.
MozReview-Commit-ID: Bp4Ng6gKUa1
--HG--
extra : rebase_source : 8b9dc3480c021beef91922ef3d00f8f5465bb1dc
extra : source : b4a7b91df34da2fe8fe9eda5e3860f9dcd103733
Kaku Kuo