MediaBrowser: Handle onServiceConnected/Disconnected in the given thread

The class assumes that the member variables are accessed in the same thread
when the class was created, but onServiceConnected/Disconnected is called
in the main thread according to the documentation.

Bug: 25307613
Change-Id: I86b63cc45fbc6995cedce39f5c151e99f76172d0
1 file changed