Revert "Expose userActivityTimeout through @SystemApi getter/setter."
Revert "Expose userActivityTimeout through @SystemApi getter/setter."

This reverts commit 40a0ee65f269cffa7d3fb0646bd987a69df5c2d0.

Change-Id: Ida1a40db25643f97e82d517bcf147f23e4a3a0fe

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base