Google on Thursday patched 13 vulnerabilities in Chrome 8 (stable), and debuted Google's built-in PDF viewer, an alternative to the bug-plagued Adobe Reader plug-in, and included support for the still-not-launched Chrome Web Store.The 13 flaws fixed in Chrome 8.0.552.215 are in a variety of components, including the browser's history, its video indexing and the display of SVG (scalable vector graphics) animations. Next up: Adobe and Google have collaborated to put the Flash Player plug-in inside a sandbox within the dev build of Chrome, an effort by the two companies to better protect users from attacks