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This tweaks the policy templates and examples to be clearer about
affects on the "Not Secure" UI and how wildcard hostname patterns work.

Bug: 844885
Change-Id: I49eba85762272a0bfedb4163cecad1b8e6df513a
Reviewed-on: https://chromium-review.googlesource.com/1166247Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582260}