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When NetworkService is off, URLLoader should not be used when the network
request is coming from the renderer. This CL is to use URLLoaderFactoryImpl,
which internally routes requests to ResourceDispatcherHost, for
ServiceWorkerScriptLoaderFactory.

Bug: 846237
Change-Id: Ie656f55c22bcd27a7564cdb68bc448ca24e7176e
Reviewed-on: https://chromium-review.googlesource.com/1075926Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565058}