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The latest <paper-radio-button> matches the Material Design spec. The
MD-Settings page will make use of the cr-checkbox which wraps a paper-checkbox which extends paper-radio-button.

Since paper-radio-button isn't currently used in Chromium there shouldn't
be any side effects for this change.

BUG=457513

Review URL: https://codereview.chromium.org/924623002

Cr-Commit-Position: refs/heads/master@{#316638}