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This moves the network debugging level UI from chrome://net-internals
to chrome://network.

This removes the last of the chromeos specific code from
chrome://net-internals. We should keep the links for discovery for
at least a version or two, then the chromeos tab can be removed
entirely from that UI.

Bug: 921726
Change-Id: I589a73a227b24205dde431cb4d329d200a1b6787
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261409
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782072}