Has been flaky for as long as I can see. http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=svg%2Fas-image%2Fanimated-svg-as-image-no-fixed-intrinsic-size.html
A whole host of Mac tests are flaky due to problems in SVGImage. I've finally tracked it down and maybe we'll get it sorted. I'll update 82232 to include the full list as we currently know of it. *** This bug has been marked as a duplicate of bug 82232 ***