This reverts commit 3111db91.

Reason for revert: This has runtime failures because including
cmx fragments isn't working ocrrectly. Still investigating why
this wasn't discovered by CQ.

Original change's description:
> [fuchsia] Use SDK provided gn templates for d8
>
> cr_fuchsia_package is deprecated in favor of using the Fuchsia
> SDK provided rules directly.
>
> This CL adds a cmx file specifically for v8_unittests. CMX
> files define fuchsia components, see
> https://chromium-review.googlesource.com/c/chromium/src/+/3529652
> for more info.
>
> Bug: chromium:1092804
> Change-Id: Ibf1d866ec6b94a0e1a7a7c7c443a6ee80e3b1042
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3537885
> Reviewed-by: Victor Gomes <victorgomes@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Commit-Queue: Bryant Chandler <bryantchandler@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79760}

Bug: chromium:1092804
Change-Id: Ib9a4d4f8e04c6cd7f3bd289e7c956b6115a77a25
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3572004
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Bryant Chandler <bryantchandler@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79860}