Merge "Return Result<T> from Do(Un)LoadApex()" am: 46fa45d82c

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2155095

Change-Id: Ib73a4ed9cfb73ebd26cd03d2c3119aab5f17c5e2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>