Schedule  agentDisconnected() in handler thread

BackupManager.agentDisconnected() need not acquire
ActivityManagerService lock. Post this in handler thread.
This will avoid a potential deadlock between
ActivityManagerService lock and BackupManagerService lock.

Test: Build successful

Change-Id: Iabea1159d3e2bd8980c8a0d068fb5d0583c08535
1 file changed