chromium/chrome/browser/resources/chromeos/borealis_installer/borealis_installer_icons.html

<iron-iconset-svg name="borealis_installer" size="20">
  <svg>
    <defs>
      <!--
      Inlined from Polymer's iron-icons to avoid importing everything.
      See http://goo.gl/Y1OdAq for instructions on adding additional icons.
      -->
      <g id="error">
        <path fill-rule="evenodd" clip-rule="evenodd" d="M9 10H11V6H9V10ZM10 2C5.584 2 2 5.584 2 10C2 14.416 5.584 18 10 18C14.416 18 18 14.416 18 10C18 5.584 14.416 2 10 2ZM10 16C6.6925 16 4 13.3075 4 10C4 6.6925 6.6925 4 10 4C13.3075 4 16 6.6925 16 10C16 13.3075 13.3075 16 10 16ZM9 14H11V12H9V14Z"></path>
      </g>
    </defs>
  </svg>
</iron-iconset-svg>