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This CL splits an existing Cookies API test into two separate tests,
which makes the bulk of the original test compatible with a Service
Worker-based extension. It also adds that test to the other Cookies
API tests that are run for both event page-based and Service Worker-
based extensions.

Bug: 1093066
Change-Id: If4ee1326a73a1c485d126bab54b2516f2892bc4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314876
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791356}