Removed bind from onPlay event in DrmEngine
Removed bind from onPlay event in DrmEngine

Change-Id: I803f2853a8237cbd90e75db62d6f39e014d68438

shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,TheModMaker/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player