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This reverts commit f8a44173.

Reason for revert: Breaks browser tests here
https://ci.chromium.org/ui/p/chromium/builders/ci/Mac10.15%20Tests/6369/overview

Original change's description:
> Adding more navigation-like fields to search prefetch requests
>
> This CL adds a few fields to the search prefetch resource request to
> make it more similar to a navigation request. Additionally, this adds
> capability for URLLoader throttles to defer (in this case cancel) or
> change headers on the prefetch request allowing things like variation
> headers to be added more similarly to how navigation requests have them
> added.
>
> Client hints CL:
> https://chromium-review.googlesource.com/c/chromium/src/+/2551671
>
> Bug: 1138648
> Change-Id: Ia868aa624b2f9f573a54432eb0fa62834eacd2f5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552723
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Robert Ogden <robertogden@chromium.org>
> Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833987}

TBR=kinuko@chromium.org,robertogden@chromium.org,ryansturm@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1138648
Change-Id: I7077c0f73dbc60ddd5541caed7c1a91adf04b208
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574640Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834106}