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

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

Change-Id: Ia87b87eca8254d32c3770f6237314e1932dc824d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>