[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 -s ours am: ec488310 -s ours am: 9b7b883b -s ours

am skip reason: subject contains skip directive

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

Change-Id: I907e01890e31a41818fb04612dfa08ec9513dcdf