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Most tests involving the dropdown or custom input field have been moved
to the new secure_dns_interactive_test.js as they involve testing for
focus.

This cl also re-enables CrSettingsSecureDnsTest.All, which was disabled
when the flakiness was observed.

Bug: 1040145,1057504
Change-Id: I7813849295ddf6a3ddc283a9cdd9416db64b8f2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083760Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Katharine Daly <dalyk@google.com>
Cr-Commit-Position: refs/heads/master@{#746591}