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This reverts commit ceff1a21.

Reason for revert: Fixed.

Original change's description:
> Revert "[ios] Enable preload with slim-navigation-manager."
>
> This reverts commit 101b5ae0.
>
> Reason for revert: Needs some more work, some last minute
> refactoring introduced some crashes.
>
> Original change's description:
> > [ios] Enable preload with slim-navigation-manager.
> >
> > Previously, preload required CopyStateFromAndPrune and
> > CanPruneAllButLastCommittedItem within NavigationManager, but those
> > are not supported with SlimNav. Here, preload is implemented by
> > creating a preload WebState with navigation history by restoring the
> > current WebState.
> >
> > The performance of this implementation depends on Slim
> > Navigation Manager's session restoration performance which can be
> > measured with existing kRestoreNavigationTime metric.
> >
> > Original implementation of this CL was written by eugenebut@,
> > simply updated in this resurrected CL.
> >
> > Bug: 834116
> > Change-Id: I86c9ecf7e3ed213ebaeddce6264dff3bbb8a8c94
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815702
> > Commit-Queue: Justin Cohen <justincohen@chromium.org>
> > Reviewed-by: Rohit Rao <rohitrao@chromium.org>
> > Reviewed-by: Eugene But <eugenebut@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#701228}
>
> TBR=rohitrao@chromium.org,justincohen@chromium.org,eugenebut@chromium.org,gambard@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 834116
> Change-Id: I16beb96bc2d1eab9a9c36a8e03728fd3cc23f035
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833743
> Reviewed-by: Justin Cohen <justincohen@chromium.org>
> Commit-Queue: Justin Cohen <justincohen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#701746}

Change-Id: I52889208ed3a84c08c66742e72b524adce0560af
Bug: 834116
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833706Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702004}