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Change RequestContextGetter to use CookieStoreIOS for web_view and
for web shell.
This is needed so i can remove NSHTTPCookieStorage and CookieStoreIOSPersistent
and also to remove CookieMonster entirely from Chrome for iOS

Bug: 989554
Change-Id: I2e2bf61a6638b47796c90c7012d1ac689960316e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822418
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700355}