This fixes a bug where LockScreen would turn back on due to the sequence of events that ultimately cause PasswordUnlockScreen.onResume() to be called when the device powers off. This is required because the lockscreen rebuilds itself before the screen turns off so that it's ready to show immediately when the device comes back on. Change-Id: I86a61cc3b1d77cf7f2a9a198051ea2bbe90607b2