chromium/chrome/browser/resources/ash/settings/controls/v2/settings_dropdown_row.html

<style>
  :host {
    box-sizing: border-box;
    display: block;
  }
</style>

<settings-row id="internalRow"
    label="[[label]]"
    sublabel="[[sublabel]]"
    icon="[[icon]]"
    learn-more-url="[[learnMoreUrl]]">
  <settings-dropdown-v2 id="dropdown"
      slot="control"
      pref="[[pref]]"
      value="[[value]]"
      options="[[options]]"
      disabled="[[disabled]]"
      aria-label="[[getAriaLabel(ariaLabel, label)]]"
      aria-description="[[getAriaDescription(ariaDescription, sublabel)]]"
      on-change="propagateChangeEvent_">
  </settings-dropdown-v2>
</settings-row>