Remove unused header am: 80ba2feaea am: ef858d9c6e am: bf26d51e4c am: b7434229c3

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

Change-Id: Icf7a196582dd27ae5b4e52ee178aafb6e9f4a39a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>