Remove unused typedefs am: 149b912110 am: 83af192964

Original change: https://android-review.googlesource.com/c/platform/art/+/2962592

Change-Id: Ibaac554b205e64e43a24388ebcd516e8c53c397f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>