Mark http/tests/security/svg-image-leak.html as flaky
Mark http/tests/security/svg-image-leak.html as flaky

BUG=246549
TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/15979018

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151734 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