[ios] Removed back-forward navigation API from CRWWebController.

[ios] Removed back-forward navigation API from CRWWebController.

NavigationManager API should be used for navigation instead.

BUG=661316
Committed: https://crrev.com/f00c143bc322f36f5ff919620fd57b2e021a3262
Cr-Commit-Position: refs/heads/master@{#432369}

[Eugene But (OOO till 7-30), 2016-11-11 18:13:36]

The CQ bit was checked by eugenebut@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-11 18:14:10]

Dry run: 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, 2016-11-11 18:29:08]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-11 18:29:11]

Dry run: This issue passed the CQ dry run.

[Eugene But (OOO till 7-30), 2016-11-15 00:11:00]

eugenebut@chromium.org changed reviewers:
+ kkhorimoto@chromium.org

[kkhorimoto, 2016-11-16 02:31:00]

lgtm.  yay, I love this CL! :)

[Eugene But (OOO till 7-30), 2016-11-16 02:32:13]

Glad to hear that :)

[Eugene But (OOO till 7-30), 2016-11-16 02:32:16]

The CQ bit was checked by eugenebut@chromium.org

[commit-bot: I haz the power, 2016-11-16 02:33:08]

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, 2016-11-16 02:55:36]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-16 02:57:24]

Description was changed from

==========
[ios] Removed back-forward navigation API from CRWWebController.

NavigationManager API should be used for navigation instead.

BUG=661316
==========

to

==========
[ios] Removed back-forward navigation API from CRWWebController.

NavigationManager API should be used for navigation instead.

BUG=661316

Committed: https://crrev.com/f00c143bc322f36f5ff919620fd57b2e021a3262
Cr-Commit-Position: refs/heads/master@{#432369}
==========

[commit-bot: I haz the power, 2016-11-16 02:57:25]

Patchset 2 (id:??) landed as
https://crrev.com/f00c143bc322f36f5ff919620fd57b2e021a3262
Cr-Commit-Position: refs/heads/master@{#432369}

[Eugene But (OOO till 7-30), 2016-11-16 03:42:12]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2509493003/ by eugenebut@chromium.org.

The reason for reverting is: Breaks upstream unit test..