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This is a reland of 702cbe72

The original change was reverted due to failures of the changed tests on trunk
(see crbug.com/1029292), so this updated CL uses conditional expectations based
on whether the feature is enabled.

Original change's description:
> Add HTTPDangerWarning experiment to field trial testing config
>
> Bug: 1027626
> Change-Id: I70ddfb8cb18b7e045e8c6f30ce7d398d0c2f1c1b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1929862
> Reviewed-by: Brian White <bcwhite@chromium.org>
> Reviewed-by: Carlos IL <carlosil@chromium.org>
> Reviewed-by: Steven Holte <holte@chromium.org>
> Commit-Queue: Livvie Lin <livvielin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#719730}

Bug: 1027626
Change-Id: I16415497b537b1350af79c88f76a03ef48ae488c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946671Reviewed-by: Carlos IL <carlosil@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721006}