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

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

Change-Id: I54dc921f60b90293fe5414561f2bc0200f0922fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>