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Add Windows specific code to test registry provider blocked by the policy.

Bug: 1019160
Change-Id: I5ae7c383028b2a6a51075d76b60ae01dc507034c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893572Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713555}