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This CL makes sure all JSON device policies use
DecodeJsonStringAndDropUnknownBySchema to decode the proto and adhere
to the associated schema. Unknown properties are dropped. If the json
string can't be decoded or does not comply with the associated schema
in policy_templates.json, the policy value will be set to the original
json string. This way, the faulty value can still be seen in
chrome://policy along with any errors/warnings.

Bug: 855054
Change-Id: I73a2bc7cc88a293b06339482437f88ac48932b83
Reviewed-on: https://chromium-review.googlesource.com/1163507Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585451}