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This reverts commit 702cbe72.

Reason for revert: The modified tests broke on linux-chromeos-google-rel

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}

TBR=bcwhite@chromium.org,holte@chromium.org,carlosil@chromium.org,livvielin@chromium.org

Change-Id: I1f1812c6dcdc8d78c505e39c8a14440279ae0111
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1027626
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1942808Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719975}