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This CL prepares the CertificateReportingServiceFactory for the launch
of Safe Browsing per-profile NetworkContexts. Since it does not need
cookies, we will be using the profile-wide SharedURLLoaderFactory, and
setting the credentials_mode to omit credentials.

Bug: 1049833
Change-Id: If479c178501f93523697248bc484e28ab515aa0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357465
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800386}