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To get cross-origin prefetches to work with SplitCache enabled, we'll
want to create a URLLoaderFactory via CreateNetworkServiceDefaultFactory
with a non-default NetworkIsolationKey. To do this, we'll need to
communicate a NetworkIsolationKey to
CreateNetworkServiceDefaultFactoryInternal. This CL changes both of
these methods to accept NetworkIsolationKey parameters.

This CL introduces no observable difference, but will make it easier to
create the URLLoaderFactories we'd like for cross-origin main-resource
prefetch requests.

See https://docs.google.com/document/d/1bKGDIePAuF6YXmmrwM33LeLvtuCsla3vTspsxsNp-f8/edit#heading=h.9a0qg5l6gbnj.

R=kinuko@chromium.org, yhirano@chromium.org

Bug: 939317
Change-Id: Ib2100dc2ad7efd9f33ac22e0bd6edb14cf816c05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730572Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683117}