Cookie Store API: Add more WPT coverage for Service Worker.

Bug: 729800
Change-Id: I5de81be0eb6cd2f90722e42655ce58ef52d3d26f
Reviewed-on: https://chromium-review.googlesource.com/831254
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524860}
14 files changed