MediaPlayerService: avoid invalid static cast am: ee0a0e39ac am: 7b6a85546c am: b07255f603 am: d560830823 am: 51efd24460 am: 8d32201d4a am: 2b5ee9c8e4 am: 17744ab9d7
am: 77da9683de

Change-Id: I62d0277bc1dd8b0514486c2f8006d76e8b88085e