Revert "Portals: Add test that portals can't load data, javascript or about URLs."

This reverts commit 53511d46a059446be0913c208f24b313d050c932.

Reason for revert: The test is failing everywhere, because sheriffbot
reverted https://chromium-review.googlesource.com/c/chromium/src/+/1615499
which was apparently required to let this pass.

Original change's description:
> Portals: Add test that portals can't load data, javascript or about URLs.
> 
> Bug: 962500
> Change-Id: Ib5e275a7f31be3a7e24dfc7bf976b6e2866624fb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614703
> Commit-Queue: Lucas Gadani <lfg@chromium.org>
> Reviewed-by: Jeremy Roman <jbroman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#661004}

TBR=jbroman@chromium.org,lfg@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 962500
Change-Id: I3422d26293a92bfd5653222b1335251a0f398dae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1619065
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661200}
1 file changed