The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22

commit 91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22
Author: eugenebut <eugenebut@chromium.org>
Date: Tue Feb 21 16:40:31 2017

Refactored callbacks for opening a new window.

This CL replaces 4 callbacks:
 webPageOrderedOpen:referrer:windowName:inBackground:
 webPageOrderedOpen
 webController:shouldBlockPopupWithURL:sourceURL:
 webController:didBlockPopup:

with a single callback:
 webController:createWebControllerForURL:openerURL:initiatedByUser:

This makes ios code more similar to other platforms where windows
are open via single WebContentsDelegate::AddNewContents callback
and all popup blocking logic lives in chrome layer.

This is a precursory CL to move window opening callback to
WebStateDelegate.

BUG= 622072 , 674991 

Review-Url: https://codereview.chromium.org/2692803004
Cr-Commit-Position: refs/heads/master@{#451778}

[modify] https://crrev.com/91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22/ios/chrome/browser/tabs/tab.mm
[modify] https://crrev.com/91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22/ios/chrome/browser/ui/browser_view_controller.mm
[modify] https://crrev.com/91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22/ios/web/public/web_state/ui/crw_web_delegate.h
[modify] https://crrev.com/91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22/ios/web/web_state/js/resources/core.js
[modify] https://crrev.com/91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22/ios/web/web_state/ui/crw_web_controller.mm
[modify] https://crrev.com/91cfb3ad9a9b9502aed2f9bc76c5d3cc96105f22/ios/web/web_state/ui/crw_web_controller_unittest.mm