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Align the behavior of navigator.credentials.store() with the spec [1]
when deciding if the |iconURL| of the passed in PasswordCredential or
FederatedCredential is an `a priori authenticated URL`.

[1]: https://www.w3.org/TR/mixed-content/#a-priori-authenticated-url

Bug: 740081
Change-Id: I2d9ae6c61cc0f3cf3687dfe99aec09b08b078efd
Reviewed-on: https://chromium-review.googlesource.com/833913Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525301}