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This reverts commit 953678c5.

Reason for revert: test failures: crbug.com/1017035

Original change's description:
> Add WebGPU to about:flags on Windows
> 
> Now that all of the work on the Chromium and Dawn side to support
> Windows has been complete, we need to add WebGPU to about:flags
> on Windows.
> 
> Bug: 966580
> Change-Id: I41d9f892be0d849c5ece1d5569f98344a7a92a1e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873383
> Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
> Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#708405}

TBR=cwallez@chromium.org,sunnyps@chromium.org,rafael.cintron@microsoft.com

Change-Id: I3ee918a6073ea6244381ff497b078f424e179dfa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 966580
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875013Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708497}