Replace api_files prop to api_contributions am: 25b6cedb am: 1e98131d am: 0581e4cd

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2756400



Change-Id: I35c99f172e8b368db33f669ceaf5e9ee7a95eff2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>