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* Don't require an action status, as it's not required in the spec.
* Add an override for duration type to allow time values so validator
  doesn't delete it.
* Set live details before checking whether they are there.
* Check the URL values for interaction type instead of string.

All of the example media feed items are fetched with these changes.

Change-Id: I891afc2d1f6650a164f28a402b30ce248be5aa4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149906
Commit-Queue: Sam Bowen <sgbowen@google.com>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759445}