Merge "Remove proguard.flags from shared/" into tm-qpr-dev am: 180e21a9fe

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20446402

Change-Id: Ic9095193379122bc2227f14646e99eb9245bfcb2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>