[ios] Use -[WKWebView serverTrust] instead of certificateChain on iOS 10.

[ios] Use -[WKWebView serverTrust] instead of certificateChain on iOS 10.

|certificateChain| WKWebView method is deprecated on iOS 10 and
|serverTrust| must be used instead.

BUG=628699
Committed: https://crrev.com/049741269398bcc7c2b9aaf309d175d1fac9d90b
Cr-Commit-Position: refs/heads/master@{#407812}

[Eugene But (OOO till 7-30), 2016-07-15 18:43:47]

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

[davidben, 2016-07-15 18:45:07]

(I'm at IETF until the week after next, so you probably want to find a different
reviewer if you want this looked at before then.)

[Eugene But (OOO till 7-30), 2016-07-15 18:47:19]

On 2016/07/15 18:45:07, davidben (OOO until 7-25) wrote:
> (I'm at IETF until the week after next, so you probably want to find a
different
> reviewer if you want this looked at before then.)
Yeah, I saw that you are OOO, and I'm perfectly fine to wait until you back.
Thanks!

[davidben, 2016-07-26 14:57:10]

lgtm

[Eugene But (OOO till 7-30), 2016-07-26 15:19:48]

Thanks!

[Eugene But (OOO till 7-30), 2016-07-26 15:19:51]

The CQ bit was checked by eugenebut@chromium.org

[commit-bot: I haz the power, 2016-07-26 15:20:17]

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, 2016-07-26 15:50:32]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-26 15:53:20]

Description was changed from

==========
[ios] Use -[WKWebView serverTrust] instead of certificateChain on iOS 10.

|certificateChain| WKWebView method is deprecated on iOS 10 and
|serverTrust| must be used instead.

BUG=628699
==========

to

==========
[ios] Use -[WKWebView serverTrust] instead of certificateChain on iOS 10.

|certificateChain| WKWebView method is deprecated on iOS 10 and
|serverTrust| must be used instead.

BUG=628699

Committed: https://crrev.com/049741269398bcc7c2b9aaf309d175d1fac9d90b
Cr-Commit-Position: refs/heads/master@{#407812}
==========

[commit-bot: I haz the power, 2016-07-26 15:53:21]

Patchset 2 (id:??) landed as
https://crrev.com/049741269398bcc7c2b9aaf309d175d1fac9d90b
Cr-Commit-Position: refs/heads/master@{#407812}