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

<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20">
 <path d="M14.6 14L10 9.1 5.4 14 4 12.5 10 6l6 6.5z"/>
</svg>