ReEnable CookieStore unittests

Use off the record browserstate in the test to force using of non-persistent
cookie store

Bug: 956477
Change-Id: I70432fa2e5c4133e19d51267314972bb7bb67729
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585066
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654327}
2 files changed