Stop ANR dialogs from appearing when ActivityManager dialogs should not be shown

Stop ANR dialogs from appearing on devices where the ActivityManager dialogs
should not be shown. Instead, kill the process. This is preferable because the
user can't actually do anything on the device.

TESTED = runs on device with that config, simulated ANR using test app.

Change-Id: I6267000afd12ef929f0c625220184c6ab0139552