Merge "[Central Surfaces] Remove unused methods & variables from interface."...

Merge "[Central Surfaces] Remove unused methods & variables from interface." into udc-qpr-dev am: 1aaaa88d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23448832



Change-Id: I580c533e92d1a7a3d31fe6a47ca9a1c993303803
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>