Revert "Added constructor with looper param for OnSubscriptionsChangedListener"

This reverts commit 831e401c055391745691a58d0c87c48b49139f50.

Not needed now since tests create HandlerThread

BUG=25691379
Change-Id: Ic0ac3e3ef3c717fd31acb5fc8d6d81cc9995a2f7
1 file changed