[automerger skipped] Revert "Make window background blurs SystemApi" am: 3804d61f2a am: 4eef17b04c -s ours
am skip reason: Merged-In I0f7bcf34db2986d8d5e08b115a611e8e07db5917 with SHA-1 3804d61f2a is already in history
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13431934
Change-Id: Ie050e91643074f649410067ce779d2d27850177f
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