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This CL enables the HTTP-Bad feature by default and sets it to warn on all
http:// pages, and updates tests accordingly.

Bug: 837034
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I470aa09220df9e02833de8f8636ea2e66e2a6b05
Reviewed-on: https://chromium-review.googlesource.com/1029415
Commit-Queue: Emily Stark <estark@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554605}