[automerger skipped] [RESTRICT AUTOMERGE] Add hide-non-system-overlay flag for HarmfulAppWarningActivity am: 53ee9c2472 am: be7090b09e -s ours am: b0cb54d596 -s ours am: 053326ecda -s ours am: 1d63bf0386 -s ours am: ba8b0e080f -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16743244

Change-Id: Id5fbb20f6c08dbc8af3e2ec6623affbe5113e4ed