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Previously, URLLoaderFactoryGetter expects that the NetworkContext is ready when
it's initialized (URLLoaderFactoryGetter::Initialize()). However, when
ServiceWorkerServicification is on without NetworkService, the initialization
fails because URLRequestContext which is necessary to create a dummy
NetworkContext is not set at that point.
This CL splits the initialization process into two parts: creating valid
InterfacePtrs (URLLoaderFactoryGetter::Initialize()) and passing the
InterfaceRequests to the appropriate places
(URLLoaderFactoryGetter::EstablishConnection()).  NetworkContext is used only
for the latter, so EstablishConnection() is called after URLRequestContext is
set if ServiceWorkerServicification is on without NetworkService.

Bug: 829251
Change-Id: I5fbbaa2d48232965681fc96d802711369cd96528
Reviewed-on: https://chromium-review.googlesource.com/1025490Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553405}