Revert "Capture about:gpu as an artifact"

This reverts commit fb5f6b444729dd2cbb642fa4a9ff88cd081e7c50.

Reason for revert: Causes crashes in Webview

Original change's description:
> Capture about:gpu as an artifact
>
> Updates the GPU Telemetry-based tests to capture a plaintext version of
> about:gpu / chrome://gpu as a test artifact. The information is only
> retrieved when the browser is restarted with different args, so no
> additional work is done for almost every browser start.
>
> There was no significant difference in runtime with this applied when
> running a subset of the WebGPU CTS suite with ResultDB enabled.
>
> Bug: 376498163
> Change-Id: I574a48463f4824587fc8e5d077ebaba55b467094
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5984535
> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
> Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
> Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1403696}

Bug: 376498163
Change-Id: Ib637255e8f7218138f58c0519dcf57f1ebc1ec7e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6165125
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1404289}