[ios] Expose TabModel underlying WebStateList.

[ios] Expose TabModel underlying WebStateList.

In preparation of moving the ownership of WebStates to WebStateList,
expose the TabModel's WebStateList (as some of the client will need
to insert WebStates directly into the WebStateList).

Rename TabModel's list of WebStateListObserver as it contains more
than WebStateListObserverBridges.

BUG=546222
Review-Url: https://codereview.chromium.org/2769193002
Cr-Commit-Position: refs/heads/master@{#459381}
Committed: https://chromium.googlesource.com/chromium/src/+/ee21033fb48f99bb38854310b2705a9040c4116c

[sdefresne, 2017-03-23 15:05:20]

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

[sdefresne, 2017-03-23 15:05:44]

sdefresne@chromium.org changed reviewers:
+ rohitrao@chromium.org

[sdefresne, 2017-03-23 15:05:45]

Please take a look.

[commit-bot: I haz the power, 2017-03-23 15:05:46]

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, 2017-03-23 15:09:05]

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

[commit-bot: I haz the power, 2017-03-23 15:09:06]

Dry run: Try jobs failed on following builders:
  ios-device on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device/builds...)
  ios-device-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device-xcode-...)
  ios-simulator-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator-xco...)

[rohitrao (ping after 24h), 2017-03-23 16:53:58]

lgtm

[sdefresne, 2017-03-23 16:56:10]

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

[commit-bot: I haz the power, 2017-03-23 16:56:31]

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, 2017-03-23 17:24:30]

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

[commit-bot: I haz the power, 2017-03-23 17:24:31]

Dry run: Try jobs failed on following builders:
  win_chromium_compile_dbg_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_comp...)

[sdefresne, 2017-03-24 09:36:07]

The CQ bit was checked by sdefresne@chromium.org

[sdefresne, 2017-03-24 09:36:08]

The patchset sent to the CQ was uploaded after l-g-t-m from
rohitrao@chromium.org
Link to the patchset: https://codereview.chromium.org/2769193002/#ps40001
(title: "Rebase on origin/master.")

[commit-bot: I haz the power, 2017-03-24 09:36:18]

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, 2017-03-24 09:43:15]

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

[commit-bot: I haz the power, 2017-03-24 09:43:16]

Try jobs failed on following builders:
  chromium_presubmit on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_compile_dbg_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  ios-device on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device/builds...)
  ios-simulator-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator-xco...)

[sdefresne, 2017-03-24 10:09:01]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2017-03-24 10:09:12]

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, 2017-03-24 10:36:58]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1490350141137390,
"parent_rev": "bf1ac35ce1af82f04ec234402b81096ac3a0dae1", "commit_rev":
"ee21033fb48f99bb38854310b2705a9040c4116c"}

[commit-bot: I haz the power, 2017-03-24 10:38:04]

Description was changed from

==========
[ios] Expose TabModel underlying WebStateList.

In preparation of moving the ownership of WebStates to WebStateList,
expose the TabModel's WebStateList (as some of the client will need
to insert WebStates directly into the WebStateList).

Rename TabModel's list of WebStateListObserver as it contains more
than WebStateListObserverBridges.

BUG=546222
==========

to

==========
[ios] Expose TabModel underlying WebStateList.

In preparation of moving the ownership of WebStates to WebStateList,
expose the TabModel's WebStateList (as some of the client will need
to insert WebStates directly into the WebStateList).

Rename TabModel's list of WebStateListObserver as it contains more
than WebStateListObserverBridges.

BUG=546222

Review-Url: https://codereview.chromium.org/2769193002
Cr-Commit-Position: refs/heads/master@{#459381}
Committed:
https://chromium.googlesource.com/chromium/src/+/ee21033fb48f99bb38854310b270...
==========

[commit-bot: I haz the power, 2017-03-24 10:38:05]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/ee21033fb48f99bb38854310b270...