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This reverts commit f672068e.

Reason for revert: Caused failing test https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/40039

Original change's description:
> [LiteVideo] Rework UKM to record on DidFinish and WCO destruction.
> 
> This change resolves the UKM recording and ties it just to the
> mainframe decision and result. It also flushes when the web contents
> observer destructs. A future change will update the event on
> rebuffers and consider more events for subframes.
> 
> Bug: 1109068
> Change-Id: Iacd04920811d96c4eedd3290309a8bad93777b58
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321520
> Auto-Submit: Michael Crouse <mcrouse@chromium.org>
> Commit-Queue: rajendrant <rajendrant@chromium.org>
> Reviewed-by: rajendrant <rajendrant@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792513}

TBR=tbansal@chromium.org,rajendrant@chromium.org,mcrouse@chromium.org

Change-Id: Ic8ccef2431cb402a285edd00b29cf78d44b03ab9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1109068, 1110739
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325295Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792528}