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This CL enables a nested blob URL worker to inherit the active service
worker from the parent worker host. `creator_worker_token` has the
parent worker token when the worker is nested, and the child worker can
access the parent's service worker via the parent worker host.

Bug: 1017034
Change-Id: If28169fa5cedac158c220d7a5f16c7874e733a3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2614526Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Asami Doi <asamidoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843409}