[automerger skipped] Merge "[RESTRICT AUTOMERGE] Add hide-non-system-overlay flag for HarmfulAppWarningActivity" into rvc-dev am: 0e5e156955 am: e7de5cde40 -s ours am: 28ba78def8 -s ours

am skip reason: subject contains skip directive

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

Change-Id: Ia228d83b84181ae5a3c721a6748114bd80527806