Merge "Temporarily disable `testBackgroundDexOptDowngradeSuccessful`." am: f4daf63940

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2448063

Change-Id: Ida34d9c9293e8fb7e79d865477a972047450402a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>