Revert "prefetch: Add WPT showing that prefetch can match traverse an…

…d reload navigations."

This reverts commit 1b56f238b3405214bbb11c8caf451735690219b4.

Reason for revert: Test is failing on many Mac bots, see crbug.com/1394569

Original change's description:
> prefetch: Add WPT showing that prefetch can match traverse and reload navigations.
>
> This came up during a spec PR review:
>   WICG/nav-speculation#212
>
> Change-Id: Ia8fb3d6c9b164fa35b196b99f1feb5750ec359f9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4062248
> Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
> Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
> Auto-Submit: Jeremy Roman <jbroman@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1077079}

Bug: 1394569
Change-Id: I0943c75654ec4f8639713994cb390c7ed4e2e636
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4064343
Owners-Override: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1077358}