[automerger skipped] Revert "Make BackgroundBlurDrawable a SystemApi" am: f83b52cc13 am: 54c4fe4486 -s ours
am skip reason: Merged-In Iee4b89b06508c7dc3b7266452bb0b987f8670fac with SHA-1 f83b52cc13 is already in history
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13431933
Change-Id: I9847ea7253a583f708a905997b050b25f2663a6e
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