Merge "[RESTRICT AUTOMERGE] Add hide-non-system-overlay flag for HarmfulAppWarningActivity" into sc-dev am: 5cf8597a1f am: a03eeb9665

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16743243

Change-Id: I674d538edf02c2c0026878ce9b994e101f28e828