TypeError event.srcElement is undefined in Firefox

Created by: davemevans

PlaybackController.onPlaybackError requires Event.srcElement. This is not available in Firefox and a TypeError is thrown.

If IE definitely needs srcElement, we should probably do something like: var target = event.target || event.srcElement; this.notify(MediaPlayer.dependencies.PlaybackController.eventList.ENAME_PLAYBACK_ERROR, {error:target.error});

I thought target was supported in IE9 onwards so we can probably just change it to event.target.error, but I'll defer to an IE expert.