[ios] Do not lock schemes registry in WebTest.

[ios] Do not lock schemes registry in WebTest.

WebTest is a videly used test fixture and it should not lock schemes and
allow other tests to register own schemes.

BUG=610619
Committed: https://crrev.com/044bdfa06dfe1480fa26c6cb178af13f38bd2a3f
Cr-Commit-Position: refs/heads/master@{#392937}

[Eugene But (OOO till 7-30), 2016-05-10 17:19:29]

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

[Eugene But (OOO till 7-30), 2016-05-10 17:19:29]

After landing this I will unwind changes made here:
https://chromereviews.googleplex.com/423787013/patch/60001/70002

And then will move Schemes registration to test suite.

[sdefresne, 2016-05-11 08:50:42]

lgtm

[Eugene But (OOO till 7-30), 2016-05-11 15:23:08]

The CQ bit was checked by eugenebut@chromium.org

[commit-bot: I haz the power, 2016-05-11 15:23:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1962333002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1962333002/1

[commit-bot: I haz the power, 2016-05-11 16:01:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-11 16:03:59]

Description was changed from

==========
[ios] Do not lock schemes registry in WebTest.

WebTest is a videly used test fixture and it should not lock schemes and
allow other tests to register own schemes.

BUG=610619
==========

to

==========
[ios] Do not lock schemes registry in WebTest.

WebTest is a videly used test fixture and it should not lock schemes and
allow other tests to register own schemes.

BUG=610619

Committed: https://crrev.com/044bdfa06dfe1480fa26c6cb178af13f38bd2a3f
Cr-Commit-Position: refs/heads/master@{#392937}
==========

[commit-bot: I haz the power, 2016-05-11 16:04:00]

Patchset 1 (id:??) landed as
https://crrev.com/044bdfa06dfe1480fa26c6cb178af13f38bd2a3f
Cr-Commit-Position: refs/heads/master@{#392937}