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Since interventions actually block or change browser behavior, their
messages should be reported as errors rather than just warnings.

Bug: 564071
Change-Id: Id8f1110466f127903bd362c4c7ada454aa3df0d6
Reviewed-on: https://chromium-review.googlesource.com/985028Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Paul Meyer <paulmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547896}