[automerger skipped] [RESTRICT AUTOMERGE] Add hide-non-system-overlay flag for...

[automerger skipped] [RESTRICT AUTOMERGE] Add hide-non-system-overlay flag for HarmfulAppWarningActivity am: 9c5c42ad am: 0281b203 am: 4436955d -s ours am: d43a5c62 -s ours

am skip reason: subject contains skip directive

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

Change-Id: Ide15dfd970c043dd5b131765c56fe307b81012e3