[iOS] Fix initialisation of net::URLRequestContext.

[iOS] Fix initialisation of net::URLRequestContext.

After https://codereview.chromium.org/2067843003, the factory method
net::URLRequestContextBuilder::SetHttpNetworkSessionComponents checks
that ct_policy_enforcer and cert_transparency_verifier are set but
did not fix all code path on iOS (as some of them are only excercised
by downstream tests).

So this CL move the ownership of net::CTPolicyVerifier to the globals
variable of IOSChromeIOThread (instead of leaking it) and correctly
pass this to the net::URLRequestContext created.

BUG=620179
Committed: https://crrev.com/5e6deacd502aea944eaaa37ad51936ad877462af
Cr-Commit-Position: refs/heads/master@{#400957}

[sdefresne, 2016-06-21 09:52:18]

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

[sdefresne, 2016-06-21 09:52:19]

Please take a look and send to CQ if LGTY.

[rohitrao (ping after 24h), 2016-06-21 10:31:52]

lgtm

[sdefresne, 2016-06-21 11:17:38]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2016-06-21 11:17:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2084723003/1

[commit-bot: I haz the power, 2016-06-21 11:53:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-21 11:55:36]

Description was changed from

==========
[iOS] Fix initialisation of net::URLRequestContext.

After https://codereview.chromium.org/2067843003, the factory method
net::URLRequestContextBuilder::SetHttpNetworkSessionComponents checks
that ct_policy_enforcer and cert_transparency_verifier are set but
did not fix all code path on iOS (as some of them are only excercised
by downstream tests).

So this CL move the ownership of net::CTPolicyVerifier to the globals
variable of IOSChromeIOThread (instead of leaking it) and correctly
pass this to the net::URLRequestContext created.

BUG=620179
==========

to

==========
[iOS] Fix initialisation of net::URLRequestContext.

After https://codereview.chromium.org/2067843003, the factory method
net::URLRequestContextBuilder::SetHttpNetworkSessionComponents checks
that ct_policy_enforcer and cert_transparency_verifier are set but
did not fix all code path on iOS (as some of them are only excercised
by downstream tests).

So this CL move the ownership of net::CTPolicyVerifier to the globals
variable of IOSChromeIOThread (instead of leaking it) and correctly
pass this to the net::URLRequestContext created.

BUG=620179

Committed: https://crrev.com/5e6deacd502aea944eaaa37ad51936ad877462af
Cr-Commit-Position: refs/heads/master@{#400957}
==========

[commit-bot: I haz the power, 2016-06-21 11:55:37]

Patchset 1 (id:??) landed as
https://crrev.com/5e6deacd502aea944eaaa37ad51936ad877462af
Cr-Commit-Position: refs/heads/master@{#400957}