Gardening: svg/custom tests are flaky on Mac
Gardening: svg/custom tests are flaky on Mac

svg/custom/getSubStringLength.html
svg/custom/font-face-cascade-order.svg

BUG=311469
TBR=jsbell

Review URL: https://codereview.chromium.org/42063004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160531 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs