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We test 6 out of the 7 possible URLs:

 - about:blank
 - the initial empty doc
 - about:srcodc
 - data:
 - blob:
 - filesystem:

We do not test javascript:, since we cannot load in a sandboxed iframe
(even with `sandbox = "allow-scripts"`).

Fixed: chromium:1167697
Change-Id: I8c4c634bd7c0cc7d1ed9a6c1148f63fa79f7dfcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637616
Auto-Submit: Titouan Rigoudy <titouan@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Titouan Rigoudy <titouan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844765}