chrome/browser/resources/settings/site_settings/media_picker.html

    <style include="settings-shared md-select">
      :host {
        display: block;
      }
    </style>
    <div class="cr-row first" id="picker" hidden>
      <select id="mediaPicker" class="md-select" on-change="onChange_"
          aria-label$="[[label]]">
        <template is="dom-repeat" items="[[devices]]">
          <option value$="[[item.id]]">[[item.name]]</option>
        </template>
      </select>
    </div>