CleanupPreviousUpdateAction: cancel pending tasks on destroy am: d1d52a0b4b am: f907149bd2 am: 65da56d58b

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1439372

Change-Id: I8b5e26f2685e0bd0a188cb795e1d6e048bef419e