https://chromium-review.googlesource.com/c/chromium/src/+/986460 was sent 

This bug requires manual review: Less than 15 days to go before AppStore submit on M66
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), josafat@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8a3582784a7bf7f5a5518101f32f31eaf7660207

commit 8a3582784a7bf7f5a5518101f32f31eaf7660207
Author: mrefaat <mrefaat@chromium.org>
Date: Thu Mar 29 21:18:18 2018

Disable WKHTTPSystemCookieStore usage.

This will be merged to M66 to disable it in release

Bug:  827310 

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I333fcb47eda7c0c56cd1f01ba2a69f91d2650b25
Reviewed-on: https://chromium-review.googlesource.com/986460
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#546888}(cherry picked from commit d43b9609c10ef7e15d220422d08bc2b3398d7ebd)
Reviewed-on: https://chromium-review.googlesource.com/986615
Cr-Commit-Position: refs/branch-heads/3359@{#506}
Cr-Branched-From: 66afc5e5d10127546cc4b98b9117aff588b5e66b-refs/heads/master@{#540276}
[modify] https://crrev.com/8a3582784a7bf7f5a5518101f32f31eaf7660207/ios/web/features.mm