I think that issue described in bug was caused by invalid value specified in policy value which was not using [URL blocklist filter format](https://support.google.com/chrome/a/answer/9942583?visit_id=639106413840124234-777735865&p=url_blocklist_filter_format&rd=1). I added unit test to verify that it works when value is using blocklist format and port is specified. I also updated policy description and example values to use correct format.
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| Code-Review | +1 |
const GURL kGoogle("https://google.com");Nit: could we cover the scheme as well by adding a URL with `http://`?
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Nit: could we cover the scheme as well by adding a URL with `http://`?
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