Remove unused prebuilt Java protobuf library dependency. am: 05a11e4188 am: d5a666e844 am: dc2a2faf5e

Original change: https://android-review.googlesource.com/c/platform/frameworks/layoutlib/+/2220471

Change-Id: Ib19c8522900dffdd78ee2865564e5b4206368e85
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>