ServiceWorker: Remove the obsolete "parsed" state [2/3]

Spec: https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-state

[1] Blink: https://codereview.chromium.org/678253002/
[2] Chromium: THIS PATCH
[3] Blink: https://codereview.chromium.org/683733002/

BUG=424081
TEST=content_unittests --gtest_filter=ServiceWorker*

Review URL: https://codereview.chromium.org/685503004

Cr-Commit-Position: refs/heads/master@{#301612}
2 files changed