svg/as-background-image/animated-svg-animation-control.html is flaky with oilpan

BUG=354785
TBR=fs@opera.com

Review URL: https://codereview.chromium.org/266363004

git-svn-id: svn://svn.chromium.org/blink/trunk@173431 bbb929c8-8fbe-4397-9dbb-9b2b20218538