Merge "Fix errorprone warnings that should be errors" am: 6d585ed76c am: 78a43f6c9c am: ce22ebc557

Original change: https://android-review.googlesource.com/c/platform/packages/inputmethods/LatinIME/+/2256807

Change-Id: I0b54d410fdabe3424e0eff31153048e474e93923
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>