Revert of Cleaned up old navigation code that did not use pending navigation item.

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}
Committed: https://chromium.googlesource.com/chromium/src/+/ac76b4841c801b4dfe13d96a76e767d34593e63d

[rohitrao (ping after 24h), 2017-03-16 19:37:41]

The CQ bit was checked by rohitrao@chromium.org

[rohitrao (ping after 24h), 2017-03-16 19:37:42]

Created Revert of Cleaned up old navigation code that did not use pending
navigation item.

[commit-bot: I haz the power, 2017-03-16 19:38:22]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-16 19:39:10]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489693061633810, "parent_rev":
"fd9de243db6ec8ca24ebc018b0a3de3d2edc148a", "commit_rev":
"ac76b4841c801b4dfe13d96a76e767d34593e63d"}

[commit-bot: I haz the power, 2017-03-16 19:39:51]

Description was changed from

==========
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/+/2feaa058530953a2232e6128e16d...

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
==========

to

==========
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/+/2feaa058530953a2232e6128e16d...

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}
Committed:
https://chromium.googlesource.com/chromium/src/+/ac76b4841c801b4dfe13d96a76e7...
==========

[commit-bot: I haz the power, 2017-03-16 19:39:55]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/ac76b4841c801b4dfe13d96a76e7...