Merge "Revert "Allow bar to be transparent if letterbox contains bar"" into rvc-dev am: 64682e76f2 am: 6ddc9881ae am: 28c6db6b88

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12128053

Change-Id: Ifb3391913958399055b1f63a0a8ea3940b9deeeb