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: I97bc047bea0531fdd1e6077713f4cac709ff0d8c