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This change adds an implementation of the net error diagnostics dialog
for Chrome OS. Now if the connectivity diagnostics webui feature is
enabled, the new application is launched, otherwise the legacy chrome
app is launched.

Bug: 1144261
Change-Id: I924cc5c2fbedfb1a7a5cba90fcd6bbf0b3f48855
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510799
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Edward Jung (EMEA) <edwardjung@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825701}