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This CL moves the logic to disable lite videos on seek
behind experiment parameter, and also disables that by default.

The param can be enabled again once we are reasonably confident
that it's not too aggressive and we can run an experiment to
verify that.

Bug: 1145646
Change-Id: Iedeb82abc1124568986f8d87cf92ef2f48c5eb2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2524925
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: rajendrant <rajendrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826172}