Revert "Support HTMLVideoElement as GPUImageCopyExternalImage Valid Source"

This reverts commit 6d1678c709c838fd6de568a124db01d59e4c9fd0.

Reason for revert: https://crbug.com/1396078: colours are wrong on M1 Mac

Original change's description:
> Support HTMLVideoElement as GPUImageCopyExternalImage Valid Source
>
> This CL add ability for CopyExternalImageToTexture() to copy from HTMLVideoElement.
>
> It imports HTMLVideoElement to ExternalTexture first and then calls
> CopyExternalTextureForBrowser() in Dawn.
>
> Bug: chromium:1361363
>
> Change-Id: Ia520a8daaecac35945b836772fdfad83e73a30df
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4027653
> Commit-Queue: Shaobo Yan <shaobo.yan@intel.com>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1079059}

Bug: chromium:1361363
Change-Id: If24f07752884c503295e7157e2cc196ecf880379
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4081347
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Robert Kroeger <rjkroege@google.com>
Commit-Queue: Robert Kroeger <rjkroege@chromium.org>
Auto-Submit: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1079336}