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Before this CL, routes for both browser and OS where in routes.js file.
This CL removes routes for chromeOS to a new file os_settings_routes.js
also updates references to SettingsRoutes to OSSettingsRoutes in all
chromeOS files.

Fixed:967861

Change-Id: Ib3aea093fad90188699e7325632dc93610336f99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090794Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Cr-Commit-Position: refs/heads/master@{#751587}