In the HTTP Basic Auth login prompt, show the URL in a usable way.
In the HTTP Basic Auth login prompt, show the URL in a usable way.

Use the standard url_formatter:FormatUrlForSecurityDisplay function.

BUG=527574,496965

Review URL: https://codereview.chromium.org/1324273002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#347463}

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