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It seems BrowserContextKeyedServiceFactory returns a null context if in
incognito mode. This CL adds an overload to return a context when the
policy blacklist is being requested from an incognito context.

Bug: 821653
Change-Id: Iac2fab5c52bfb79fcee08d8e3ba9b05f4bef6c8b
Reviewed-on: https://chromium-review.googlesource.com/961383
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543108}