Android S Beta 3
[contexthub] Use new jsoncpp API am: 06670e75e5

Original change: https://android-review.googlesource.com/c/device/google/contexthub/+/1615047

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8cb2558b5ab8e7cbca6a681c12ef4191b9b53622