chromium/chrome/browser/resources/print_preview/ui/layout_settings.html

<style include="print-preview-shared md-select"></style>
<print-preview-settings-section>
  <span id="layout-label" slot="title">$i18n{layoutLabel}</span>
  <div slot="controls">
    <select class="md-select" aria-labelledby="layout-label"
        disabled$="[[disabled]]" value="{{selectedValue::change}}">
      <option value="portrait" selected>$i18n{optionPortrait}</option>
      <option value="landscape">$i18n{optionLandscape}</option>
    </select>
  </div>
</print-preview-settings-section>