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The network ONC strings are used both in //chrome and //chromeos.
Strings that are required in both locations need to be moved to
//chromeos to prevent a layering violation. Screenshots are added in
this change as they were not required when these strings were originally
added. This change moves the remaining cellular, tether, and EAP
strings.

Bug: chromium:1159069
Change-Id: Ifa804cea9be794b8d93091cfd286bb87bd1d7314
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638221Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Trent Begin <tbegin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845048}