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Also move corresponding tests to os_settings_browsertest.js.

This UI is already available on the OS Settings, and does not need
to be shown in the browser settings.

Bug: 986596
Change-Id: Ia8043cd0a97e4142e62766a5576b4f232fc6cdaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992818
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730236}