GitLab

Revert of Cleaned up old navigation code that did not use pending navigation item. (patchset #4 id:60001 of https://codereview.chromium.org/2751793002/ )

Reason for revert:
testReloadInterstitial is failing on an internal bot.  For an example, see build 4404 on the internal iphone10-simulator bot.

Original issue's description:
> Cleaned up old navigation code that did not use pending navigation item.
>
> Also removed PendingIndexNavigationDisabled experimental setting.
>
> BUG=692331,701717
> TEST=Back forward navigation works correctly.
>
> Review-Url: https://codereview.chromium.org/2751793002
> Cr-Commit-Position: refs/heads/master@{#457459}
> Committed: https://chromium.googlesource.com/chromium/src/+/2feaa058530953a2232e6128e16deb31192ad9d2

TBR=kkhorimoto@chromium.org,eugenebut@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=692331,701717

Review-Url: https://codereview.chromium.org/2759483002
Cr-Commit-Position: refs/heads/master@{#457519}