GenericSource: reset mDrmManagerClient when mDataSource is cleared. am: 224858e719 am: 69c8e36da7 am: 3fcddfd23a am: e01ba47052 am: adadada4f0 am: ddb3d77dad am: 301a55c115 am: 8a7f184caf
am: d58f15c332

* commit 'd58f15c3329123d9506263a07301b70a86e9bc17':
  GenericSource: reset mDrmManagerClient when mDataSource is cleared.