chromium/ui/file_manager/file_manager/foreground/images/files/ui/back.svg

<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20">
  <path d="M6.437 9l5.017-4.766L10.179 3 3 10l7.179 7 1.266-1.234L6.437 11H17V9z"/>
</svg>