GitLab

This function will be used in New Download API and can also be used for
SystemCookieStore creation.

TBR=michaeldo@chromium.org

Bug: None
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I5f85c59a6e759f226b01937e598db866273f1838
Reviewed-on: https://chromium-review.googlesource.com/744325Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513224}