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With iOS11 there is API to access WKHTTPCookieStore and through
WKHTTPSystemCookieStore, URLFetcher can use this api to set and get
cookies from WKHTTPCookieStore

This should fix PDF download problems, it also should allow suggestions
queries to send cookies and will use cookies for NTP tiles.

Bug: 779106, 831678
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I59637ebde557fae09cfd39105d84675724ac0140
Reviewed-on: https://chromium-review.googlesource.com/1050404
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558824}