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This WebUI should be loaded instead on any chrome://* if it's set to be
disabled by an admin policy.

The html page to be loaded is a basic page, and will be changed upon UI
review.

Bug: 1061859
Change-Id: I50c72c744458b141fb777cf9758ca970c2638a66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098906
Commit-Queue: Aya Elsayed <ayaelattar@google.com>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751378}