Merge "[RESTRICT AUTOMERGE] Add hide-non-system-overlay flag for HarmfulAppWarningActivity" into rvc-dev am: 0e5e156955

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16743363

Change-Id: I39fb93608e88a2478410faabd5c1bcf70300e740