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

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

Change-Id: I04c908e4a6b159ed9cd1441c979288671d1f843e