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This CL adds summaries and explanations for safety tips to the
security tab of devtools. It assigns the precedence of warnings
as SafeBrowsing > Safety Tips > Connection status.

Bug: 1013374
Change-Id: I62524947a8c4588af78a430e0565e0969b8dc3bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856680
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706169}