chrome/browser/resources/options/chromeos/preferred_networks.html

<div id="preferredNetworksPage" class="page" hidden>
  <div class="close-button"></div>
  <h1 id="preferred-networks-page-title" 
      i18n-content="preferredNetworksPage"></h1>
  <div class="content-area">
    <div class="settings-list">
      <list id="remembered-network-list"></list>
    </div>
  </div>
  <div class="action-area">
    <div class="button-strip">
      <button id="preferred-networks-confirm" class="default-button"
          i18n-content="done">
      </button>
    </div>
  </div>
</div>