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This CL creates a Finch flag for separating SafeBrowsingNetworkContexts
and depending on that flag, creates separate network contexts for each
Profile. Future CLs will port users of the SafeBrowsingNetworkContext
to the Profile-scoped contexts. (For example,
https://chromium-review.googlesource.com/c/chromium/src/+/2044716)

Bug: 1049833
Change-Id: I36e9ecd43e3ce5ceb6333850bcde7ea61065bd5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083576
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Bettina Dea <bdea@chromium.org>
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747380}