Revert of Replace TabModel with WebStateList in GoogleLandingController.

Revert of Replace TabModel with WebStateList in GoogleLandingController. (patchset #7 id:110001 of https://codereview.chromium.org/2833513002/ )

Reason for revert:
Broke downstream eg tests, needs some minor fixes.

Original issue's description:
> Replace TabModel with WebStateList in GoogleLandingController.
> 
> BUG=694750
> 
> Review-Url: https://codereview.chromium.org/2833513002
> Cr-Commit-Position: refs/heads/master@{#466542}
> Committed: https://chromium.googlesource.com/chromium/src/+/892edbbf57698e574b6b2b15481239af1c5c4ede

TBR=rohitrao@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=694750
Review-Url: https://codereview.chromium.org/2835033002
Cr-Commit-Position: refs/heads/master@{#466563}
Committed: https://chromium.googlesource.com/chromium/src/+/a3eecd718f060080ce740a75fc6fa57a2b9061ec

[justincohen, 2017-04-23 14:46:50]

The CQ bit was checked by justincohen@chromium.org

[justincohen, 2017-04-23 14:46:51]

Created Revert of Replace TabModel with WebStateList in GoogleLandingController.

[commit-bot: I haz the power, 2017-04-23 14:46:56]

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, 2017-04-23 14:47:24]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1492958810053880, "parent_rev":
"afcc086a9fc9d6ab25edb24bdf60ce8fca66c021", "commit_rev":
"a3eecd718f060080ce740a75fc6fa57a2b9061ec"}

[commit-bot: I haz the power, 2017-04-23 14:47:34]

Description was changed from

==========
Revert of Replace TabModel with WebStateList in GoogleLandingController.
(patchset #7 id:110001 of https://codereview.chromium.org/2833513002/ )

Reason for revert:
Broke downstream eg tests, needs some minor fixes.

Original issue's description:
> Replace TabModel with WebStateList in GoogleLandingController.
> 
> BUG=694750
> 
> Review-Url: https://codereview.chromium.org/2833513002
> Cr-Commit-Position: refs/heads/master@{#466542}
> Committed:
https://chromium.googlesource.com/chromium/src/+/892edbbf57698e574b6b2b154812...

TBR=rohitrao@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=694750
==========

to

==========
Revert of Replace TabModel with WebStateList in GoogleLandingController.
(patchset #7 id:110001 of https://codereview.chromium.org/2833513002/ )

Reason for revert:
Broke downstream eg tests, needs some minor fixes.

Original issue's description:
> Replace TabModel with WebStateList in GoogleLandingController.
> 
> BUG=694750
> 
> Review-Url: https://codereview.chromium.org/2833513002
> Cr-Commit-Position: refs/heads/master@{#466542}
> Committed:
https://chromium.googlesource.com/chromium/src/+/892edbbf57698e574b6b2b154812...

TBR=rohitrao@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=694750

Review-Url: https://codereview.chromium.org/2835033002
Cr-Commit-Position: refs/heads/master@{#466563}
Committed:
https://chromium.googlesource.com/chromium/src/+/a3eecd718f060080ce740a75fc6f...
==========

[commit-bot: I haz the power, 2017-04-23 14:47:35]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/a3eecd718f060080ce740a75fc6f...