Fix malformed json expectations am: 5bdddf911d am: 1d010d4594 am: 06d120cec0 am: f89664e4fa

Original change: https://android-review.googlesource.com/c/platform/art/+/2117746

Change-Id: I2af639f625f74a4f0b7dfb223f0c6f11bb1d383d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>