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Experiment period has not seen any statistically differences in
proceed or action rates on the security interstitials.

Removing all experiment code. This will also fix the refresh flicker
from the JS classname switching.

Bug: 978002
Change-Id: Ida9649772ff6e5e0ddbcc10f779c3545884e42ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010947
Commit-Queue: Edward Jung (EMEA) <edwardjung@chromium.org>
Reviewed-by: John Delaney <johnidel@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736789}