Revert "Use scoped access in WebGPUMailboxTexture"

This reverts commit 076dc2293da0138bd5bf94a10850196294cca4dd.

Reason for revert: suspect for multiple WebGPU CTS failures,
which cause machines to hang:
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Android%20arm%20Release%20(Pixel%204)/53480/overview
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Android%20arm64%20Release%20(Pixel%206)/18988/overview
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Linux%20x64%20Release%20(Intel%20UHD%20630)/42820/overview
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Linux%20x64%20Release%20(Intel%20UHD%20770)/11346/overview
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Linux%20x64%20Release%20(NVIDIA)/139453/overview
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Mac%20x64%20Release%20(Intel)/126135/overview
https://ci.chromium.org/ui/p/chromium/builders/ci/Dawn%20Mac%20x64%20Release%20(AMD)/133407/overview

Bug: 40286368
Original change's description:
> Use scoped access in WebGPUMailboxTexture
>
> This CL refactors WebGPU operations in WebGPUMailboxTexture with the
> WebGPUTextureScopedAccess class, and also, on platforms where Dawn is
> not used, disables the WebGPUSwapBufferProviderTest which would cause
> a conflict between the native and wire Dawn types.
>
> Bug: 40286368
> Change-Id: I0767e9ae9b38a4115afe72da0b0fa460a538af4c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6735231
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
> Commit-Queue: Mingjing Zhang <mjzhang@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1489601}

Bug: 40286368
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I22e51921343f7b01b217feb139943d83ec14ffa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6772925
Reviewed-by: Karol Sygiet <sygiet@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Auto-Submit: Yuly Novikov <ynovikov@chromium.org>
Owners-Override: Karol Sygiet <sygiet@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Cr-Commit-Position: refs/heads/main@{#1490111}