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These tests were set cookie settings on a CookieManager interface, and
then sending out a network request on a URLLoaderFactory interface.
Since Mojo events aren't ordered, there's no guarantee that the request
will be sent after the new settings are set.

This CL fixes that issue by flushing the CookieManager interface after
updating the cookie settings.

Bug: None
Change-Id: I1d355a81f935f40a8e1270ca49234bc6b5eb4a86
Reviewed-on: https://chromium-review.googlesource.com/1159192Reviewed-by: Clark DuVall <cduvall@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580128}