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This is a reland of 4e23e8e8

Patchset 1 is what previously landed. This caused flakes in other
loading predictor browser tests, so I added the holdback to all
of the tests. In a follow-up, I will make sure the tests check
for preconnects on the appropriate URLs.

See https://chromium-review.googlesource.com/c/chromium/src/+/2004181
for revert rationale.

Original change's description:
> Adding a FTT config for PreconnectSameOriginDesktop
>
> This experiment is in canary/dev and should be moved to Beta.
>
> Bug: 1038774
> Change-Id: I4fc9c44e2b68aa58f9eee7210a625103f45edb01
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992684
> Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
> Reviewed-by: Alex Ilin <alexilin@chromium.org>
> Reviewed-by: Ilya Sherman <isherman@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#732219}

Bug: 1038774
Change-Id: Id7bd4bddf5b5812d02a8953d0733f8af73007fb6

TBR=tbansal@chromium.org,alexilin@chromium.org

Change-Id: Id7bd4bddf5b5812d02a8953d0733f8af73007fb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004691Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732553}