Fix json format in expectations file am: 2a89d29a16 am: 0ed80a184a am: 6a5b2a092f

Original change: https://android-review.googlesource.com/c/platform/art/+/2111847

Change-Id: Ie0d577c55c0f9986f292274938a6ba829a573ce5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>