Revert "Match prefetches against render requests"

This reverts commit 74fb3b3d2ce4a37d407ee8e939fa53fb5e4aad45.

Reason for revert: New unit tests are failing in the following builder:
https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20Tests%20(dbg)(1)/123028/overview

Original change's description:
> Match prefetches against render requests
>
> Call the matching code from PrefetchMatchingURLLoaderFactory. If the
> newly-added "NetworkContextPrefetchUseMatches" feature is enabled, also
> allow successful matches to be consumed by the renderer. Otherwise, only
> the histograms indicating matching success or failure will be logged.
> The prefetch is abandoned after a delay but the renderer may still
> be able to use the disk cache entry it created.
>
> Add check that the `request_initiator` is valid so that the render
> process cannot bypass access checks when a prefetch is matched.
>
> Rename the SetClient() method of network::PrefetchURLLoaderClient to
> Consume() and make it take a PendingReceiver<URLLoader> argument. The
> CorsURLLoader that the client is bound to is rebound to the passed-in
> argument, permitted it to be called from the render process directly.
> Add a Matches() method which calls PrefetchMatches() against the stored
> ResourceRequest.
>
> Also refactor the PrefetchURLLoaderClient tests to provide a more
> realistic environment.
>
> Currently tests that call Consume() leak memory and so are disabled on
> sanitizer builds. See https://crbug.com/375425822. This memory leak only
> happens if the "NetworkContextPrefetchUseMatches" feature is enabled and
> will be fixed before that is used in production.
>
> BUG=342445996
>
> Low-Coverage-Reason: TESTS_IN_SEPARATE_CL Uncovered code has no callers yet.
> Change-Id: I607db0dbbf8017730b56de3baa4d66d2b15268ae
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5715614
> Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
> Commit-Queue: Adam Rice <ricea@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1374542}

Bug: 342445996, 375425822
Change-Id: I7293583afc1f1d0291b693b2e1f47f3d492adcdb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5971793
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Felipe Andrade <fsandrade@chromium.org>
Owners-Override: Felipe Andrade <fsandrade@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1374591}