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This change involves:

- Use net::CookieStoreIOS instead of using WKHTTPCookieStore directly.
  -[WKHTTPCookieStore getAllCookies] has a bug that it sometimes doesn't
  call its completion handler immediately
  (https://openradar.appspot.com/39470983). net::CookieStoreIOS
  implements a workaround of the bug.

Bug: 938123
Change-Id: Ica8f3855d3f7355a3903f56e7744abd9f5edb024
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1511094
Commit-Queue: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701479}