GitLab

* Allow null author in mojo struct. Author is only needed for video
  type, not tv series/movie.
* Remove number of seasons.
* Remove number of episodes on media feed item, should only be embedded
  in the season now.
* Add type sort key in JS so more than one item can be displayed.
* Only get live data for movie/video. TV live data should be embedded
  in the episode (future CL).

Change-Id: I9dfa2fa0bd3b9a9dfa947669f455ecb57dd6f5c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144673Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Sam Bowen <sgbowen@google.com>
Cr-Commit-Position: refs/heads/master@{#758911}