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This change groups the network diagnostic routines into similar
categories to simplify the UI. This brings the app in closer alignment
to the original Chrome App.

https://screenshot.googleplex.com/9TA8y5z4gDKC3hB

Bug: chromium:1142857
Change-Id: I6336106a0d6b945012d6e6c93b98f1f0a46fca8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561294
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833842}