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When ServiceWorkerServicification is enabled, this CL is to make
ServiceWorkerURLLoaderJob and ServiceWorkerSubresourceLoader work without
NetworkService. This CL tries to create an URLLoaderRequestHandler for a service
worker (ServiceWorkerControlleeRequestHandler) even if no NetworkService flag.

ServiceWorkerServicification still doesn't work since
ServiceWorkerURLLoaderJob::ProceedWithResponse() hasn't been implemented yet.

Bug: 752394
Change-Id: I808346f248bba254e20e708d372dde46ecc103fe
Reviewed-on: https://chromium-review.googlesource.com/888361Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547053}