Remove InputManager#getInstance am: 1232b1336a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/layoutlib/+/22252423

Change-Id: I28522efe40f6a401e989a7bb1cc28e2320ce068a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>