Revert "Added updateEngine_downloadAction_fuzzer" am: 2bedf8ce32

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2055665

Change-Id: If045d6ca3fd4078d47064eba648e7076b6b7b4ba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>