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This CL removes the hack to write the CHROME_CONNECTED cookie using
a WKWebView and instead uses the cookie manager API. This works well
as the Chrome iOS cookie manager is now backed by the WKHTTPCookieStore.

Bug: 1102794

Change-Id: Ida2d74372616ce8331eadbde507fb131e4afa0ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2323901
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794243}