Merge "Remove unused LOCK_SCREEN_SHOW_SILENT_NOTIFICATIONS usage" into tm-qpr-dev am: 68ec906e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20191012



Change-Id: I654a26d6b84a16eabf4a4b287b1d3d19e975441e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>