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Currently, using
--enable-blink-features=Portals
or
--enable-blink-test-features
causes renderer kills because the renderer enables portals for itself
with runtime_enabled_features, however the browser only considers the
blink::features::kPortals feature.

We have the renderer respect the value of blink::features::kPortals.
We now ignore --enable-blink-features=Portals when the browser does not
have portals enabled and only set portals' experimental/test status if
the blink::features::kPortals default allows for it.

Since now portals are not exposed for the blink testing config for web
tests, we remove their interface listing expectations.

Bug: None
Change-Id: I02fe241e2ddd17d86eda896b2b2fa21c36bcb682
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518427
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825114}