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The LiteVideoObserver observes media rebuffering events and sends
a stop throttling message to the hints agent. This should only
happen if LiteVideos were allowed and a hint sent in the first
place. This also removes the dcheck in the hints agent as
the design changed so the DCHECK is not needed.

Bug: 1125922
Change-Id: I3b65a78acc54bd267ecbabd03e8fd23bea99aad7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398958Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: rajendrant <rajendrant@chromium.org>
Commit-Queue: rajendrant <rajendrant@chromium.org>
Auto-Submit: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804953}