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This is a follow-up CL to creating an alternative radio group called
cr-radio-group and replacing all usages of paper-radio-group with
cr-radio-group.

Bug: 888922
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I6637190f8eb63409c16ff70f6a7bc65872442780
Reviewed-on: https://chromium-review.googlesource.com/c/1277526
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602249}