Remove unused header am: 80ba2feaea am: ef858d9c6e

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2774951

Change-Id: I8c8a00434c9de076c7b08d77496f2a9a153ec0b7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>