Revert "[media_preview] Add tests for VideoStreamCoordinator metrics"

This reverts commit 91cf594e.

Reason for revert: Failing builds and causing the tree to go down

Original change's description:
> [media_preview] Add tests for VideoStreamCoordinator metrics
>
> This covers PixelHeight, ExpectedFPS, ActualFPS,
> RenderedPercent.
>
> Fixed: b:329663133, b:329664065, b:329664520, b:330394977
> Change-Id: Ida86331e0959718218e5526d1e7a31de42b1684b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5401460


> Reviewed-by: Ahmed Moussa <ahmedmoussa@google.com>
> Commit-Queue: Bryant Chandler <bryantchandler@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1282717}

Change-Id: Ib2709e257379a2625767e860af377a247179fcdd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5426875
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: David Pennington <dpenning@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1282723}